fix: require min typescript v3.7

Keen Yee Liau · Keen Yee Liau · commit ef6093b00584 · 2020-01-15T11:41:15.000-08:00
diff --git a/server/src/version_provider.ts b/server/src/version_provider.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-const MIN_TS_VERSION = '3.6';
+const MIN_TS_VERSION = '3.7';
 const MIN_NG_VERSION = '9.0';
 
 /**
