Remove unneeded date in CHANGELOG.md
* Fixed: `JCommander#getParameters` returning nothing, #315, (@simon04)
* Fixed: Allow empty string (e.g. `java -jar jcommander-program.jar param1 ""`) as part of main parameter, #306 (@jeremysolarz)
* Fixed: Default value for `@Parameter(help=true)` parameter is not displayed in output of `JCommander.usage()`, #305 (@jeremysolarz)
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-2016-12-16
* Fixed: When providing two names in `@Parameter` always first name is given to `IValueValidator`, #309 (@jeremysolarz)
### 1.58
