Fix error message

ahejlsberg · ahejlsberg · commit 02395a9b271c · 2019-09-27T15:17:49.000-07:00
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
@@ -2730,7 +2730,7 @@
         "category": "Error",
         "code": 2775
     },
-    "Assertions require the call target to be an identifier or qualified-name.": {
+    "Assertions require the call target to be an identifier or qualified name.": {
         "category": "Error",
         "code": 2776
     },
