Update emsdk version

JohnTitor · JohnTitor · commit 353848906066 · 2020-07-08T03:52:23.000+09:00
diff --git a/ci/emscripten.sh b/ci/emscripten.sh
@@ -2,7 +2,7 @@
 
 set -ex
 
-EMSDK_VERSION=1.39.16
+EMSDK_VERSION=1.39.19
 
 hide_output() {
   set +x
