Bump guard from 2.18.1 to 2.19.0 (#198)

Author: dependabot[bot]

Gemfile.lock

@@ -96,7 +96,7 @@ GEM
       octokit (>= 4, < 8)
       public_suffix (>= 3.0, < 6.0)
       typhoeus (~> 1.3)
-    guard (2.18.1)
+    guard (2.19.0)
       formatador (>= 0.2.4)
       listen (>= 2.7, < 4.0)
       lumberjack (>= 1.0.12, < 2.0)
@@ -242,7 +242,7 @@ GEM
     logger (1.6.0)
     lumberjack (1.2.10)
     mercenary (0.3.6)
-    method_source (1.0.0)
+    method_source (1.1.0)
     mini_portile2 (2.8.7)
     minima (2.5.1)
       jekyll (>= 3.5, < 5.0)
@@ -289,7 +289,7 @@ GEM
     simpleidn (0.2.3)
     terminal-table (1.8.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    thor (1.3.1)
+    thor (1.3.2)
     typhoeus (1.4.1)
       ethon (>= 0.9.0)
     tzinfo (2.0.6)