Use '#!/usr/bin/env bash' for portability

The location of bash executive is not always '/bin/bash' for all
system

build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Bibata Build
 

install.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 
 INPUT=$1
 

src/install

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 
 show_question() {
   echo -e "\033[1;34m$@\033[0m"

tweak.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 animate_fix(){
     cursor=$1