Add pwsh as an alias for Powershell (#3236)

Author: tebeco

CHANGES.md

@@ -2,6 +2,7 @@
 
 Grammars:
 
+- enh(powershell) added `pwsh` alias (#3236) [tebeco][]
 - fix(r) fix bug highlighting examples in doc comments [Konrad Rudolph][]
 - fix(python) identifiers starting with underscore not highlighted (#3221) [Antoine Lambert][]
 - enh(clojure) added `edn` alias (#3213) [Stel Abrego][]
@@ -14,6 +15,8 @@ Grammars:
 [Antoine Lambert]: https://github.com/anlambert
 [Angelika Tyborska]: https://github.com/angelikatyborska
 [Konrad Rudolph]: https://github.com/klmr
+[tebeco]: https://github.com/tebeco
+
 
 ## Version 11.0.0
 

src/languages/powershell.js

@@ -345,6 +345,7 @@ export default function(hljs) {
   return {
     name: 'PowerShell',
     aliases: [
+      "pwsh",
       "ps",
       "ps1"
     ],