also scope the \n at the end of line comments as comment.line (#125)

Author: keith-hall

PowerShellSyntax.tmLanguage

@@ -398,7 +398,7 @@
 				</dict>
 			</dict>
 			<key>end</key>
-			<string>$</string>
+			<string>$\n?</string>
 			<key>name</key>
 			<string>comment.line.powershell</string>
 			<key>patterns</key>