Merge pull request #149 from rec/documentation

Document flags to git-open

Author: derimagia

README.md

@@ -8,8 +8,20 @@ Type `git open` to open the repo website (GitHub, GitLab, Bitbucket) in your bro
 
 ```sh
 git open [remote-name] [branch-name]
+    # Open the page for this branch on the repo website
+
+git open --commit
+git open -c
+   # Open the current commit in the repo website
 
 git open --issue
+git open -i
+   # If this branch is named like issue/#123, this will open the corresponding
+   # issue in the repo website
+
+git open --print
+git open -p
+    # Only print the url at the terminal, but don't open it
 ```
 
 (`git open` works with these [hosted repo providers](#supported-remote-repositories), `git open --issue` currently only works with GitHub, Visual Studio Team Services and Team Foundation Server)