Fix rubocop warning

Author: DemetrisChr

Rakefile

@@ -187,7 +187,7 @@ task :cache_cxx_dependencies do
           "spdlog/*/spdlog/LICENSE",
           "spdlog/*/spdlog/cmake/*",
           "spdlog/*/spdlog/include/**/*",
-          "spdlog/*/spdlog/src/**/*",
+          "spdlog/*/spdlog/src/**/*"
         ].grep_v(/crypto_test_data.cc|googletest/)
 
         # we don't want to fail if git is not available