Treat 'filter' like a function so it appears in Symbol List

Author: fbehrens

Support/PowershellSyntax.tmLanguage

@@ -246,7 +246,7 @@
 		</dict>
 		<dict>
 			<key>match</key>
-			<string>(?&lt;!\w)((?i:begin|break|catch|continue|data|define|do|dynamicparam|else|elseif|end|exit|filter|finally|for|foreach(?!-object)|from|if|in|inlinescript|parallel|param|process|return|switch|throw|trap|try|until|using|var|where(?!=-object)|while)|%|\?)(?!\w)</string>
+			<string>(?&lt;!\w)((?i:begin|break|catch|continue|data|define|do|dynamicparam|else|elseif|end|exit|finally|for|foreach(?!-object)|from|if|in|inlinescript|parallel|param|process|return|switch|throw|trap|try|until|using|var|where(?!=-object)|while)|%|\?)(?!\w)</string>
 			<key>name</key>
 			<string>keyword.control.powershell</string>
 		</dict>
@@ -522,7 +522,7 @@
 		<key>function</key>
 		<dict>
 			<key>begin</key>
-			<string>((?i:function|configuration|workflow))\s+((?:\p{L}|\d|_|-|\.)+)</string>
+			<string>((?i:function|filter|configuration|workflow))\s+((?:\p{L}|\d|_|-|\.)+)</string>
 			<key>beginCaptures</key>
 			<dict>
 				<key>0</key>