update changelog - allow cachedir override

Author: sudo-suhas

CHANGELOG.md

@@ -7,6 +7,8 @@ NEW FEATURES:
 (#1206)
 * `dep ensure -no-vendor -dry-run` now exits with an error when changes would
 have to be made to `Gopkg.lock`. This is useful for CI. (#1256)
+* Allow override of cache directory location using environment variable
+`DEPCACHEDIR`. (#1234)
 
 BUG FIXES:
 
@@ -52,7 +54,7 @@ importer would drop the imported version of a project (#1100)
 * Import analyzer now always uses the same name, fixing the lock mismatch
 immediately after dep init issue (#1099)
 * Add support for importing from [govend](https://github.com/govend/govend)
-(#1040) and [LK4D4/vndr](https://github.com/LK4D4/vndr) (#978) based projects 
+(#1040) and [LK4D4/vndr](https://github.com/LK4D4/vndr) (#978) based projects
 * gps: gps no longer assumes that every git repo has a HEAD (#1053)
 * `os.Chmod` failures on Windows due to long path length has been fixed (#925)
 * Add `version` command (#996)