Better caldav support (#73)

vendor/github.com/beevik/etree/RELEASE_NOTES.md

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+Release v1.1.0
+==============
+
+**New Features**
+
+* New attribute helpers.
+  * Added the `Element.SortAttrs` method, which lexicographically sorts an
+    element's attributes by key.
+* New `ReadSettings` properties.
+  * Added `Entity` for the support of custom entity maps.
+* New `WriteSettings` properties.
+  * Added `UseCRLF` to allow the output of CR-LF newlines instead of the
+    default LF newlines. This is useful on Windows systems.
+* Additional support for text and CDATA sections.
+  * The `Element.Text` method now returns the concatenation of all consecutive
+    character data tokens immediately following an element's opening tag.
+  * Added `Element.SetCData` to replace the character data immediately
+    following an element's opening tag with a CDATA section.
+  * Added `Element.CreateCData` to create and add a CDATA section child
+    `CharData` token to an element.
+  * Added `Element.CreateText` to create and add a child text `CharData` token
+    to an element.
+  * Added `NewCData` to create a parentless CDATA section `CharData` token.
+  * Added `NewText` to create a parentless text `CharData`
+    token.
+  * Added `CharData.IsCData` to detect if the token contains a CDATA section.
+  * Added `CharData.IsWhitespace` to detect if the token contains whitespace
+    inserted by one of the document Indent functions.
+  * Modified `Element.SetText` so that it replaces a run of consecutive
+    character data tokens following the element's opening tag (instead of just
+    the first one).
+* New "tail text" support.
+  * Added the `Element.Tail` method, which returns the text immediately
+    following an element's closing tag.
+  * Added the `Element.SetTail` method, which modifies the text immediately
+    following an element's closing tag.
+* New element child insertion and removal methods.
+  * Added the `Element.InsertChildAt` method, which inserts a new child token
+    before the specified child token index.
+  * Added the `Element.RemoveChildAt` method, which removes the child token at
+    the specified child token index.
+* New element and attribute queries.
+  * Added the `Element.Index` method, which returns the element's index within
+    its parent element's child token list.
+  * Added the `Element.NamespaceURI` method to return the namespace URI
+    associated with an element.
+  * Added the `Attr.NamespaceURI` method to return the namespace URI
+    associated with an element.
+  * Added the `Attr.Element` method to return the element that an attribute
+    belongs to.
+* New Path filter functions.
+  * Added `[local-name()='val']` to keep elements whose unprefixed tag matches
+    the desired value.
+  * Added `[name()='val']` to keep elements whose full tag matches the desired
+    value.
+  * Added `[namespace-prefix()='val']` to keep elements whose namespace prefix
+    matches the desired value.
+  * Added `[namespace-uri()='val']` to keep elements whose namespace URI
+    matches the desired value.
+
+**Bug Fixes**
+
+* A default XML `CharSetReader` is now used to prevent failed parsing of XML
+  documents using certain encodings.
+  ([Issue](https://github.com/beevik/etree/issues/53)).
+* All characters are now properly escaped according to XML parsing rules.
+  ([Issue](https://github.com/beevik/etree/issues/55)).
+* The `Document.Indent` and `Document.IndentTabs` functions no longer insert
+  empty string `CharData` tokens.
+
+**Deprecated**
+
+* `Element`
+    * The `InsertChild` method is deprecated. Use `InsertChildAt` instead.
+    * The `CreateCharData` method is deprecated. Use `CreateText` instead.
+* `CharData`
+    * The `NewCharData` method is deprecated. Use `NewText` instead.
+
+
+Release v1.0.1
+==============
+
+**Changes**
+
+* Added support for absolute etree Path queries. An absolute path begins with
+  `/` or `//` and begins its search from the element's document root.
+* Added [`GetPath`](https://godoc.org/github.com/beevik/etree#Element.GetPath)
+  and [`GetRelativePath`](https://godoc.org/github.com/beevik/etree#Element.GetRelativePath)
+  functions to the [`Element`](https://godoc.org/github.com/beevik/etree#Element)
+  type.
+
+**Breaking changes**
+
+* A path starting with `//` is now interpreted as an absolute path.
+  Previously, it was interpreted as a relative path starting from the element
+  whose
+  [`FindElement`](https://godoc.org/github.com/beevik/etree#Element.FindElement)
+  method was called.  To remain compatible with this release, all paths
+  prefixed with `//` should be prefixed with `.//` when called from any
+  element other than the document's root.
+* [**edit 2/1/2019**]: Minor releases should not contain breaking changes.
+  Even though this breaking change was very minor, it was a mistake to include
+  it in this minor release. In the future, all breaking changes will be
+  limited to major releases (e.g., version 2.0.0).
+
+Release v1.0.0
+==============
+
+Initial release.