Updated changelog to reflect most recent changes

Author: adamgotterer

CHANGELOG.markdown

@@ -1,7 +1,7 @@
 Next Release
 ============
 
-* [#211](https://github.com/intridea/grape/pull/211): Fix: Custom param validator shouldn't validate when optional and param not present - [@adamgotterer](https://github.com/adamgotterer).
+* [#211](https://github.com/intridea/grape/pull/211): Updates to validation and coercion: Fix #211 and force order of operations for presence and coercion - [@adamgotterer](https://github.com/adamgotterer).
 * [#210](https://github.com/intridea/grape/pull/210): Fix: `Endpoint#body_params` causing undefined method 'size' - [@adamgotterer](https://github.com/adamgotterer).
 * [#201](https://github.com/intridea/grape/pull/201): Rewritten `params` DSL, including support for coercion and validations - [@schmurfy](https://github.com/schmurfy).
 * [#205](https://github.com/intridea/grape/pull/205): Fix: Corrected parsing of empty JSON body on POST/PUT - [@tim-vandecasteele](https://github.com/tim-vandecasteele).