Update dependency simplecov to v1

Author: renovate[bot]

Gemfile.lock

@@ -143,7 +143,6 @@ GEM
       railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
-    docile (1.4.1)
     dotenv (3.2.0)
     dotenv-rails (3.2.0)
       dotenv (= 3.2.0)
@@ -420,13 +419,8 @@ GEM
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
       logger
-    simplecov (0.22.0)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.13.2)
+    simplecov (1.0.0)
     simplecov-lcov (0.9.0)
-    simplecov_json_formatter (0.1.4)
     sprockets (4.2.2)
       concurrent-ruby (~> 1.0)
       logger