Added support for GitHub, updated README link to stable release

Author: Nikita Chernyi

README.md

@@ -18,14 +18,14 @@
 * Commits that file with commit summary `Release v<NEW_VERSION>`
 * Creates new tag with release version and changes list as message
 * Pushes commit with new tag and updated changelog
-* Opens Gitlab Merge Request (url generated from origin url) with predefined title and branches in browser
+* Opens Gitlab Merge Request or GitHub Pull Request (url generated from origin url) with predefined title and branches in browser
 
 **PLEASE**, use http://semver.org/
 
 ## Integration with git
 
 ```bash
-sudo curl -o /usr/local/bin/git-bump -s https://raw.githubusercontent.com/titanium-codes/bump.sh/master/bin && sudo chmod +x /usr/local/bin/git-bump
+sudo curl -o /usr/local/bin/git-bump -s https://raw.githubusercontent.com/titanium-codes/bump.sh/stable/bin && sudo chmod +x /usr/local/bin/git-bump
 git config --global alias.bump "git-bump"
 ```
 

bin

@@ -50,5 +50,9 @@ echo -e "$PREFIX Pushing..."
 git push origin --follow-tags
 
 # Open merge request url with preset changes
-xdg-open "https://$REPO_URL/merge_requests/new?utf8=✓&merge_request[source_branch]=$BRANCH_1&merge_request[target_branch]=$BRANCH_2&merge_request[title]=$NEW_VERSION"
+if [[ $REPO_URL == *"gitlab"* ]]; then
+    xdg-open "https://$REPO_URL/merge_requests/new?utf8=✓&merge_request[source_branch]=$BRANCH_1&merge_request[target_branch]=$BRANCH_2&merge_request[title]=$NEW_VERSION"
+elif [[ $REPO_URL == *"github"* ]]; then
+    xdg-open "https://$REPO_URL/compare/$BRANCH_1...$BRANCH_2&pull_request[title]=$NEW_VERSION"
+fi
 echo -e "$PREFIX Don't forget to notify your teammates about new release!"