Issue #35: Emscripten: Update Cmake to 3.12.2

docker/trzeci/emscripten/Dockerfile

@@ -41,9 +41,9 @@ RUN echo "\n## Start building" \
 &&	apt-get -qq -y update && apt-get -qq install -y --no-install-recommends -t jessie-backports openjdk-8-jre-headless \
     \
 &&	echo "\n## Installing CMake" \
-&&	wget https://cmake.org/files/v3.7/cmake-3.7.2-Linux-x86_64.sh -q \
+&&	wget https://cmake.org/files/v3.12/cmake-3.12.2-Linux-x86_64.sh -q \
 &&	mkdir /opt/cmake \
-&&	printf "y\nn\n" | sh cmake-3.7.2-Linux-x86_64.sh --prefix=/opt/cmake > /dev/null \
+&&	printf "y\nn\n" | sh cmake-3.12.2-Linux-x86_64.sh --prefix=/opt/cmake > /dev/null \
 &&		rm -fr cmake*.sh /opt/cmake/doc \
 &&		rm -fr /opt/cmake/bin/cmake-gui \
 &&		rm -fr /opt/cmake/bin/ccmake \

emscripten.md

@@ -92,6 +92,7 @@ Helper command: `./build compile trzeci/emscripten:sdk-tag-1.37.17-64bit` (where
 * **Docker: emscripten-slim**: https://hub.docker.com/r/trzeci/emscripten-slim/
 
 ## History
+* **1.38.22** [#35](https://github.com/asRIA/emscripten-docker/issues/35) upgrade to `cmake` 3.12.2
 * **1.38.9** `/emsdk_portable` will be preserved as a git repos (with valid version of changeset)
 * **1.38.7** Version removed due problems with [emsdk](https://github.com/juj/emsdk/pull/156)
 * **1.37.29** upgrade to `cmake` 3.7.2