[docs] update changelog and readme

CHANGELOG.md

@@ -5,23 +5,21 @@ See also <https://github.com/mazzy-ax/Write-ProgressEx/releases>.
 
 ## [v0.21](https://github.com/mazzy-ax/Write-ProgressEx/compare/v0.20...v0.21) - 2019-03-28
 
-* feature added:
-  * Show activity in the console title
 * parameters added:
   * `Remaining`
   * `ShowConsoleTitle`
   * `ShowElapsed`
-* performance improved:
 * features improved:
   * UpdateInterval, Reset, Elapsed, Remaining, PercentComplete, SecondsRemaining
   * `auto name` feature works with functions and script names
-* examples improved:
+* performance improved
+* examples improved
   * param `delayMS` added to examples. The default value (30 ms) is used when the user runs this script, 0 is used in unit tests
   * `Write-ProgressEx` with empty arguments added to the begin of each example. It fixes problems when the user interrupts the example and runs another example
   * `-ShowConsoleTitle` parameter added to the pipe example
 * style fixed:
   * trail spaces removed due style check
-  * for case-sensitive systems, the name of the `Write-ProgressEx` method and other methods always uses same spelling
+  * for case-sensitive systems, the name of methods and properties uses same case
 
 ## [v0.20](https://github.com/mazzy-ax/Write-ProgressEx/compare/v0.19...v0.20) - 2018-05-13
 

README.md

@@ -105,6 +105,10 @@ or manual:
 * Set an execution policy to `RemoteSigned` or `Unrestricted` to execute not signed modules `Set-ExecutionPolicy RemoteSigned`.
 * Run `Import-Module Write-ProgressEx`.
 
+## Known issues
+
+* Unable to import module on case-sensitive file systems. Thanks @jasonchester for the [workaround](https://github.com/mazzy-ax/Write-ProgressEx/issues/5)
+
 ## Changelog
 
 * [CHANGELOG.md](CHANGELOG.md)