Update demo script in README

README.md

 
 ```
 #!/bin/sh
-if [ "$(cat ~/.gitagile | grep $(basename -s .git `/usr/lib/git-core/git config --get remote.origin.url`))" ]; then
-    if [ "$1" = "push" ]; then
-        if [ "$(/usr/lib/git-core/git branch | grep '^* master')" ] || [ "$(/usr/lib/git-core/git branch | grep '^* sprint-')" ]; then
-            /bin/echo -e "033[1;31m ⚠ Current branch is protected.033[0m\nNo push allowed\nSee $PROTECT_LIST to change it or bypass it in invocating $GIT_APP_PATH \n"
-            exit
+if [ -d .git ]; then
+    if [ "$(cat ~/.gitagile | grep $(basename -s .git `/usr/lib/git-core/git config --get remote.origin.url`))" ]; then
+        if [ "$1" = "push" ]; then
+            if [ "$(/usr/lib/git-core/git branch | grep '^* master')" ] || [ "$(/usr/lib/git-core/git branch | grep '^* sprint-')" ]; then
+                /bin/echo -e "033[1;31m ⚠ Current branch is protected.033[0m\nNo push allowed\nSee $PROTECT_LIST to change it or bypass it in invocating $GIT_APP_PATH \n"
+                exit
+            fi
         fi
     fi
 fi