Maintenance: Update dependency terser to v1.1.13

Gemfile.lock

@@ -534,7 +534,7 @@ GEM
       faraday (~> 1.0)
       virtus (~> 2.0)
     telephone_number (1.4.18)
-    terser (1.1.12)
+    terser (1.1.13)
       execjs (>= 0.3.0, < 3)
     test-unit (3.5.5)
       power_assert