* add release date to changelog

CHANGELOG.md

@@ -1,13 +1,11 @@
 # Change Log
 
-## [2.0-rc7](https://github.com/goriy/sif/releases/tag/v.2.0-rc7) (not released yet)
+## [2.0-rc7](https://github.com/goriy/sif/releases/tag/v.2.0-rc7) (2017-06-11)
 
 **Improvements:**
 
 * added line numbers to file preview box
 
-**Fixed bugs:**
-
 
 ## [2.0-rc6](https://github.com/goriy/sif/releases/tag/v.2.0-rc6) (2017-03-23)
 
@@ -16,7 +14,7 @@
 **Improvements:**
 
 * skipped too frequent file preview refresh/redraw when choosing search results.
-  Too frequent file preview redraws (on every event from search results, 
+  Too frequent file preview redraws (on every event from search results,
   for example) led to undesired flicker (especially on slow PC).
 * do not preview files during search procedure.
 * added overall searched bytes counter to status bar.