Update assert.sh (#7)

### What

Add Copyright to `assert.sh` file.

Author: kendallgassner

assert.sh

@@ -1,5 +1,30 @@
 #!/usr/bin/env bash
 
+## 
+## MIT License
+## 
+## Copyright (c) 2016 Márk Török
+## 
+## Permission is hereby granted, free of charge, to any person obtaining a copy
+## of this software and associated documentation files (the "Software"), to deal
+## in the Software without restriction, including without limitation the rights
+## to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+## copies of the Software, and to permit persons to whom the Software is
+## furnished to do so, subject to the following conditions:
+## 
+## The above copyright notice and this permission notice shall be included in all
+## copies or substantial portions of the Software.
+## 
+## THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+## IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+## FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+## AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+## LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+## OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+## SOFTWARE.
+## 
+
+
 #####################################################################
 ##
 ## title: Assert Extension
@@ -245,4 +270,4 @@ assert_le() {
     [ "${#msg}" -gt 0 ] && log_failure "$first <= $second :: $msg" || true
     return 1
   fi
-}
+}