Copy hidden files on CircleCi

As otherwise we loose .git directory which is required for Coveralls to
report Coverage properly.

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

circle.yml

@@ -26,7 +26,7 @@ dependencies:
   override:
     - rm -rf "$HOME/.go_workspace/src/$IMPORT_PATH"
     - mkdir -p "$HOME/.go_workspace/src/$IMPORT_PATH"
-    - cp -a ./* "$HOME/.go_workspace/src/$IMPORT_PATH"
+    - cp -aT . "$HOME/.go_workspace/src/$IMPORT_PATH"
     - cd "$HOME/.go_workspace/src/$IMPORT_PATH" && make deps
 
   cache_directories: