update to v3.20.0 and fix license

PKGBUILD

@@ -4,12 +4,12 @@
 
 _pkgname="powershell-editor-services"
 pkgname="$_pkgname"
-pkgver=3.18.1
+pkgver=3.20.0
 pkgrel=1
 pkgdesc='A common platform for PowerShell development support in any editor or application'
 url="https://github.com/PowerShell/PowerShellEditorServices"
 arch=('x86_64')
-licence=('MIT')
+license=('MIT')
 
 depends=('powershell')
 
@@ -25,10 +25,8 @@ source=(
   "LICENSE-$pkgver"::"$url/raw/v$pkgver/LICENSE"
 )
 
-sha256sums=(
-  'a3105b77da3ab88364e124e3d96348dead5d1299013523b03fa8855f7c23100a'
-  '99bc3308d3b5f2018c5d7af9239548c6853a01f08db0a1d9247d16be647c5658'
-)
+sha256sums=('52330b51d9df2b833784b7eb932767178dbef35407ad46a7c3389f9157df973f'
+            '99bc3308d3b5f2018c5d7af9239548c6853a01f08db0a1d9247d16be647c5658')
 
 package() {
   mkdir -p "$pkgdir/opt/$_pkgname"