Revert ee44ce8..24c08cf

This rolls back to commit ee44ce8.

Author: William Voyek

Support/PowershellSyntax.tmLanguage

@@ -207,7 +207,7 @@
 			<key>begin</key>
 			<string>@'\n</string>
 			<key>end</key>
-			<string>^'@</string>
+			<string>^'@$</string>
 			<key>name</key>
 			<string>string.quoted.single.heredoc.powershell</string>
 			<key>patterns</key>