Merge pull request espressif#11 from leres/master

Add missing '!' to shebang line in some bash scripts

Author: me-no-dev

Diff for: tools/build-libs.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 
 #remove previous build
 rm -rf ./out ./build

Diff for: tools/install-esp-idf.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 
 source ./tools/config.sh
 

Diff for: tools/update-components.sh

@@ -1,4 +1,4 @@
-#/bin/bash
+#!/bin/bash
 
 source ./tools/config.sh