fixing #2 shell scripts codacy issues

dot_scripts/bootstrap.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # Make sure Code directory exists
 mkdir -p ~/Code
 ln -snf ~/Code/dotfiles/dot_scripts ~/.scripts

dot_scripts/install_docker_for_mac.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 docker_app=$(find /Applications/ \
                   -name "Docker.app" -maxdepth 1 -mindepth 1 -type d)
 if [ -z "$docker_app" ]; then

dot_scripts/version.sh

@@ -1 +1,2 @@
+#!/usr/bin/env bash
 rustc --version