Add status badges for travis and circle-ci (#6537)

Author: sbc100

README.md

@@ -1,5 +1,8 @@
 ![emscripten logo](media/switch_logo.png)
 
+[![Build Status](https://travis-ci.org/kripken/emscripten.svg?branch=incoming)](https://travis-ci.org/kripken/emscripten)
+[![CircleCI](https://circleci.com/gh/kripken/emscripten.svg?style=svg)](https://circleci.com/gh/kripken/emscripten)
+
 Emscripten is an [LLVM](https://en.wikipedia.org/wiki/LLVM)-to-JavaScript compiler. It takes LLVM bitcode - which can be generated
 from C/C++, using `llvm-gcc` (DragonEgg) or `clang`, or any other language that can be
 converted into LLVM - and compiles that into JavaScript, which can be run on the web (or