Update forked repository from original

sync_fork.sh

# First cd root of forked project.
git fetch upstream
git checkout master
git merge upstream/master
# if everything is ok
git push
# In normal situation you can simply run this file
#$ bash sync_fork.sh
# HELP: Before first use you must configure reference to original project
#$ git remote add upstream https://github.com/<original-author>/<repository>.git
# if you not sure about your configuration check it using 
#$ git remote -v