Replace deprecated GREP_OPTIONS with alias

dotfiles/bash/main.bashrc

 alias open='gnome-open'
 alias diff='diff -u'
 alias pad4='sed -e "s/^/    /"'
+alias grep='grep --color --binary-files=without-match'
 alias grepr='grep -nr . --exclude-dir=".git" -e '
 alias sc='se --direction=encz.cz'
 alias lsblk='lsblk -o +UUID,LABEL'
 
 export FFOO_PRETTY=color
 
-export GREP_OPTIONS="--color --binary-files=without-match"
-
 # make green git bash trinket even cooler
 export GIT_PS1_SHOWDIRTYSTATE=true
 export GIT_PS1_SHOWUNTRACKEDFILES=true