chore: changelog for 3.1.2

Author: haoqunjiang

CHANGELOG.md

@@ -1,3 +1,16 @@
+## [3.1.2](https://github.com/vuejs/component-compiler-utils/compare/v3.1.1...v3.1.2) (2020-04-08)
+
+
+### Bug Fixes
+
+* add parse options to cache key ([#78](https://github.com/vuejs/component-compiler-utils/issues/78)) ([f7b1f87](https://github.com/vuejs/component-compiler-utils/commit/f7b1f876540a4a933627df323a1d5cbeab245b28))
+* LRUCache v5 has to be invoked with new ([#83](https://github.com/vuejs/component-compiler-utils/issues/83)) ([b541fef](https://github.com/vuejs/component-compiler-utils/commit/b541feff8312f71f8966d6788490510331460023)), closes [#79](https://github.com/vuejs/component-compiler-utils/issues/79)
+
+### Others
+
+* make prettier dependency optional ([aea1b79](https://github.com/vuejs/component-compiler-utils/commit/aea1b79)), closes [#84](https://github.com/vuejs/component-compiler-utils/issues/84)
+
+
 ## [3.1.1](https://github.com/vuejs/component-compiler-utils/compare/v3.1.0...v3.1.1) (2020-01-06)
 
 ### Bug Fixes