Bump unicorn from 6.0.0 to 6.1.0

Bumps [unicorn](https://yhbt.net/unicorn/) from 6.0.0 to 6.1.0.

---
updated-dependencies:
- dependency-name: unicorn
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -13,7 +13,7 @@ GEM
     http-cookie (1.0.3)
       domain_name (~> 0.5)
     json (2.6.1)
-    kgio (2.11.3)
+    kgio (2.11.4)
     method_source (1.0.0)
     mime-types (3.3.1)
       mime-types-data (~> 3.2015)
@@ -38,7 +38,7 @@ GEM
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    raindrops (0.19.1)
+    raindrops (0.20.0)
     rake (13.0.6)
     rb-readline (0.5.5)
     redis (4.4.0)
@@ -91,7 +91,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.7)
-    unicorn (6.0.0)
+    unicorn (6.1.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)
     yajl-ruby (1.4.1)