For upload tools. (removed " [[ " tags in the first line.)

It can't upload with many luatools. Because "[[" and "]] tags using by file.write function

examples/ds18b20.lua

@@ -1,9 +1,9 @@
---[[
+--'
 -- 18b20 one wire example for NODEMCU
 -- NODEMCU TEAM
 -- LICENCE: http://opensource.org/licenses/MIT
 -- Vowstar <vowstar@nodemcu.com>
---]] 
+--' 
 
 pin = 9
 ow.setup(pin)
@@ -53,4 +53,4 @@ else
   else
     print("CRC is not valid!")
   end
-end
+end