Update changelog and readme for February (#686)

CHANGELOG.md

@@ -1,5 +1,37 @@
 # Change Log
 
+## Version 0.26.4
+* Release date: February 15, 2017
+* Release status: Public Preview
+
+## What's new in this version
+The February release fixes several important customer reported issues, as well as various feature improvements.  We've also introduced auto-update support in February which will simplify keeping updated with the lastest changes.
+
+Here's some of the highlights in the February release.
+
+* Support Auto-Update installation on Windows and macOS
+* Publish RPM and DEB packages to offical Microsoft repos
+* Fix #6 Keep connection and selected database when opening new query tabs
+* Fix #22 'Server Name' and 'Database Name' - Can these be drop downs instead of text boxes?
+* Fix #549 Silent/Very Silent Install results in application opening after installation
+* Fix #481 Add "Check for updates" option.
+* SQL Editor colorization and auto-completion fixes
+  * #584 Keyword "FULL" not highlighted by IntelliSense
+  * #345 Colorize SQL functions within the editor
+  * #300 [#tempData] latest "]" will display green color
+  * #225 Keyword color mismatch
+  * #60 invalid sql syntax color highlighting when using temporary table in from clause
+* Introduce Connection extensibility API
+* VS Code Editor 1.19 integration
+* Update JustinPealing/html-query-plan component to pick-up several Query Plan viewer improvements
+
+## Contributions and "thank you"
+We would like to thank all our users who raised issues, and in particular the following users who helped contribute fixes:
+
+* SebastianPfliegel for `Add cursor snippet (#475)`
+* mikaoelitiana for fix: `revert README and CONTRIBUTING after last VSCode merge (#574)`
+* alextercete for `Reinstate menu item to install from VSIX (#682)`
+
 ## Version 0.25.4
 * Release date: January 17, 2017
 * Release status: Public Preview