update helper

Update README to clarify permissions

README.md

@@ -74,6 +74,7 @@ $ git recall -f
 You can install it by simply copying the `git-recall` script into any existing path
 (e.g. `/usr/local/bin`) or create your own directory and add it to the `PATH` variable.
 
+Make sure to run `chmod +x /usr/local/bin/git-recall` or the directory in which you copied it to. 
 
 ##### Using NPM
 Use `npm` to install the project.

git-recall

@@ -7,7 +7,7 @@ usage() {
   Usage: git recall [options]
   Options:
     -d, --date              Show logs for last n days.
-    -a, --author            Author name.
+    -a, --author            Author name (use -a "all" for all users).
     -b, --branch            Specify branch to display commits from.
     -p  --path              Specify path or filename to display commits from.
     -f, --fetch             fetch commits.