[Lucene-java Wiki] Update of "ReleaseNote64" by jimczi

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The "ReleaseNote64" page has been changed by jimczi:
https://wiki.apache.org/lucene-java/ReleaseNote64?action=diff&rev1=8&rev2=9

- ## page was copied from ReleaseNote63
- 4 November 2016, Apache Lucene™ 6.3.0 available
+ X January 2017, Apache Lucene™ 6.4.0 available
- The Lucene PMC is pleased to announce the release of Apache Lucene 6.3.0.
+ The Lucene PMC is pleased to announce the release of Apache Lucene 6.4.0.
  
  Apache Lucene is a high-performance, full-featured text search engine
  library written entirely in Java. It is a technology suitable for nearly
@@ -14, +13 @@

    http://lucene.apache.org/core/mirrors-core-latest-redir.html
  
  Please read CHANGES.txt for a full list of new features and changes:
-   https://lucene.apache.org/core/6_3_0/changes/Changes.html
+   https://lucene.apache.org/core/6_4_0/changes/Changes.html
  
- Lucene 6.3.0 Release Highlights:
+ Lucene 6.4.0 Release Highlights:
  
  New features
-  * A brand new "!UnifiedHighlighter" derivative of the !PostingsHighlighter that can consume offsets from postings, term vectors, or analysis. It can highlight phrases as accurately as the standard Highlighter. Light term vectors can be used with offsets in postings for fast wildcard (!MultiTermQuery) highlighting.
-  * !SimpleQueryParser now parses '*' to !MatchAllDocsQuery
-  * !FuzzyQuery now matches all terms within the specified edit distance, even if they are short terms	
+  * A new similarity "!BooleanSimilarity that gives terms a score that is equal to their query boost
+  * A new analyzer "!SynonymGraphFilter" that outputs a correct graph structure for multi-token synonyms at query time
+  * Graph token streams produced by the "!SynonymGraphFilter" are now handled accurately by query parsers
+  * A new collector "!DocValuesStatsCollector" gives the ability to compute statistics on DocValues field
+  * It is now possible to filter "!SortedDocValues" and "!SortedSetDocValues" terms enum with a compiled automaton
+  * The "!UnifiedHighlighter" can now highlight fields with queries that don't necessarily refer to that field
  
  Optimizations
-   * Points do not store the implicit split dimension in the 1-dimension case. This saves between 6% memory for the largest types such an !InetAddressPoint to 33% for the smaller types such as !HalfFloatPoint.
+  * Points do not store the implicit split dimension in the 1-dimension case. This saves between 6% memory for the largest types such an !InetAddressPoint to 33% for the smaller types such as !HalfFloatPoint.
+  * The BKD in-memory index for dimensional points now uses a compressed format, using substantially less RAM in some cases
+  * The BKD writing now buffers each leaf block in heap before writing to disk, giving a small speedup in points-heavy use cases
  
  Along with numerous bug fixes.