Use emscripten 1.37.21 on Travis (same as on Circleci)

Author: axic

.travis.yml

@@ -103,7 +103,7 @@ matrix:
           before_install:
               - nvm install 7
               - nvm use 7
-              - docker pull trzeci/emscripten:sdk-tag-1.35.4-64bit
+              - docker pull trzeci/emscripten:sdk-tag-1.37.21-64bit
           env:
               - SOLC_EMSCRIPTEN=On
               - SOLC_INSTALL_DEPS_TRAVIS=Off

scripts/build_emscripten.sh

@@ -30,5 +30,5 @@ set -e
 
 if [[ "$OSTYPE" != "darwin"* ]]; then
     ./scripts/travis-emscripten/install_deps.sh
-    docker run -v $(pwd):/root/project -w /root/project trzeci/emscripten:sdk-tag-1.35.4-64bit ./scripts/travis-emscripten/build_emscripten.sh
+    docker run -v $(pwd):/root/project -w /root/project trzeci/emscripten:sdk-tag-1.37.21-64bit ./scripts/travis-emscripten/build_emscripten.sh
 fi