update CHANGES

CHANGES

@@ -22,7 +22,7 @@
 * Enable packagers to specify mirrors in url files (#807)
 * Cleaned up the command-line interface (#1250, #1170, #1472). Incompatible
   changes:
-  - 'opam switch exec': takes command args directly rather than as a string (use
+  - 'opam config exec': takes command args directly rather than as a string (use
     -- for command arguments)
   - 'opam switch import|export': now have a mandatory FILE argument. '-f' no
     longer accepted.
@@ -58,6 +58,7 @@
 * Added an 'install' field in opam files, to separate from build
 * Added the 'build', 'test' and 'doc' dependency flags to limit the scope
   of some dependencies
+* Added Check for common dependencies at init time
 * Hundreds of smaller fixes and UI improvements
 
 1.1.2