Update rubocop-minitest requirement from = 0.5.1 to = 0.10.3

Updates the requirements on [rubocop-minitest](https://github.com/rubocop-hq/rubocop-minitest) to permit the latest version.
- [Release notes](https://github.com/rubocop-hq/rubocop-minitest/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-minitest/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop-minitest@v0.5.1...v0.10.3)

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

lazylead.gemspec

@@ -90,7 +90,7 @@ tasks instead of solving technical problems."
   s.add_development_dependency "random-port", "0.5.1"
   s.add_development_dependency "rdoc", "6.3.0"
   s.add_development_dependency "rubocop", "1.8.1"
-  s.add_development_dependency "rubocop-minitest", "0.5.1"
+  s.add_development_dependency "rubocop-minitest", "0.10.3"
   s.add_development_dependency "rubocop-performance", "1.5.2"
   s.add_development_dependency "rubocop-rake", "0.5.1"
   s.add_development_dependency "rubocop-rspec", "2.1.0"