use env bash in nvm-exec and install.sh
diff --git a/install.sh b/install.sh
index c1da5b5..27b6333 100755
--- a/install.sh
+++ b/install.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 { # this ensures the entire script is downloaded #
 
diff --git a/nvm-exec b/nvm-exec
index e92d4aa..0d28870 100755
--- a/nvm-exec
+++ b/nvm-exec
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 DIR="$(command cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"