Adding a newline before the source string in the ".bash_profile"

Resolved Issue #197

install.sh

@@ -43,6 +43,7 @@ fi
 
 if ! grep -qc 'nvm.sh' $PROFILE; then
   echo "=> Appending source string to $PROFILE"
+  echo -e "\n" >> "$PROFILE"
   echo $SOURCE_STR >> "$PROFILE"
 else
   echo "=> Source string already in $PROFILE"