Add 4.4.0 podspec, updated CHANGELOG

Author: drmohundro

CHANGELOG.md

@@ -1,3 +1,9 @@
+## v4.4.0 (February 4, 2018)
+
+* Added `filter` support (via
+  [#171](https://github.com/drmohundro/SWXMLHash/pull/174) and
+  [#167](https://github.com/drmohundro/SWXMLHash/issues/170))
+
 ## v4.3.6 (January 21, 2018)
 
 * Fixed CDATA parsing in Linux (via

README.md

@@ -313,6 +313,48 @@ func enumerate(indexer: XMLIndexer) {
 enumerate(indexer: xml)
 ```
 
+### Filtering elements
+
+Given:
+
+```xml
+<root>
+  <catalog>
+    <book id=\"bk101\">
+      <author>Gambardella, Matthew</author>
+      <title>XML Developer's Guide</title>
+      <genre>Computer</genre><price>44.95</price>
+      <publish_date>2000-10-01</publish_date>
+    </book>
+    <book id=\"bk102\">
+      <author>Ralls, Kim</author>
+      <title>Midnight Rain</title>
+      <genre>Fantasy</genre>
+      <price>5.95</price>
+      <publish_date>2000-12-16</publish_date>
+    </book>
+    <book id=\"bk103\">
+      <author>Corets, Eva</author>
+      <title>Maeve Ascendant</title>
+      <genre>Fantasy</genre>
+      <price>5.95</price>
+      <publish_date>2000-11-17</publish_date>
+    </book>
+  </catalog>
+</root>
+```
+
+The following will return return "Midnight Rain". Filtering can be by any part
+of the `XMLElement` class or by index as well.
+
+```swift
+let subIndexer = xml!["root"]["catalog"]["book"]
+    .filter { elem, _ in elem.attribute(by: "id")!.text == "bk102" }
+    .filter { _, index in index >= 1 && index <= 3 }
+
+print(subIndexer[0].element?.text)
+```
+
 ### Error Handling
 
 Using Swift 2.0's new error handling feature:

SWXMLHash.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name        = 'SWXMLHash'
-  s.version     = '4.3.6'
+  s.version     = '4.4.0'
   s.summary     = 'Simple XML parsing in Swift'
   s.homepage    = 'https://github.com/drmohundro/SWXMLHash'
   s.license     = { type: 'MIT' }