Update rspec requirement from = 3.12.0 to = 3.13.0 (#203)

Gemfile.lock

@@ -39,7 +39,7 @@ GEM
     coderay (1.1.3)
     concurrent-ruby (1.2.3)
     connection_pool (2.4.1)
-    diff-lcs (1.5.0)
+    diff-lcs (1.5.1)
     docile (1.4.0)
     drb (2.2.0)
       ruby2_keywords
@@ -110,19 +110,19 @@ GEM
       chunky_png (~> 1.0)
       rqrcode_core (~> 1.0)
     rqrcode_core (1.2.0)
-    rspec (3.12.0)
-      rspec-core (~> 3.12.0)
-      rspec-expectations (~> 3.12.0)
-      rspec-mocks (~> 3.12.0)
-    rspec-core (3.12.2)
-      rspec-support (~> 3.12.0)
-    rspec-expectations (3.12.3)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.0)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-mocks (3.12.6)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.12.0)
-    rspec-support (3.12.1)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.1)
     rubocop (0.93.1)
       parallel (~> 1.10)
       parser (>= 2.7.1.5)
@@ -165,7 +165,7 @@ DEPENDENCIES
   guard-rspec (~> 4.7.3)
   pdf-inspector (~> 1.3.0)
   rake (= 13.0.6)
-  rspec (= 3.12.0)
+  rspec (= 3.13.0)
   rubocop (~> 0.93.1)
   rubocop-performance (~> 1.10.2)
   rubocop-rspec (~> 1.44.1)

br_danfe.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'guard-rspec', '~> 4.7.3'
   spec.add_development_dependency 'pdf-inspector', '~> 1.3.0'
   spec.add_development_dependency 'rake', '13.0.6'
-  spec.add_development_dependency 'rspec', '3.12.0'
+  spec.add_development_dependency 'rspec', '3.13.0'
   spec.add_development_dependency 'rubocop', '~> 0.93.1'
   spec.add_development_dependency 'rubocop-performance', '~> 1.10.2'
   spec.add_development_dependency 'rubocop-rspec', '~> 1.44.1'