update Changelog [ci skip]

Author: kripken

ChangeLog.markdown

@@ -9,6 +9,9 @@ Not all changes are documented here. In particular, new features, user-oriented
 
 Current Trunk
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+
+v1.37.17: 12/4/2017
+-------------------
  - Breaking change: Do not polyfill Math.{clz32, fround, imul, trunc} by default. A new `LEGACY_VM_SUPPORT` option enables support for legacy browsers. In `ASSERTIONS` mode, a warning is shown if a polyfill was needed, suggesting using that option.
  - Breaking change: Do not export getValue/setValue runtime methods by default. You can still use them by calling them directly in code optimized with the main file (pre-js, post-js, js libraries; if the optimizer sees they are used, it preserves them), but if you try to use them on `Module` then you must export them by adding them to `EXTRA_EXPORTED_RUNTIME_METHODS`. In `-O0` or when `ASSERTIONS` is on, a run-time error message explains that, if they are attempted to be used incorrectly.