Use incoming version of Emscripten SDK

Author: abitrolly

.travis.yml

@@ -20,8 +20,8 @@ matrix:
         - rustup component add rustfmt
         # install emsdk
         - git clone https://github.com/emscripten-core/emsdk.git
-        - ./emsdk/emsdk install latest
-        - ./emsdk/emsdk activate latest
+        - ./emsdk/emsdk install sdk-incoming-64bit
+        - ./emsdk/emsdk activate sdk-incoming-64bit
         - rustup target add asmjs-unknown-emscripten
       script:
         # the useful way to run rustfmt