fix(generator): Update core dependency to at least 0.4

Author: dazuma

google-apis-generator/google-apis-generator.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = ">= 2.5"
   gem.add_runtime_dependency "activesupport", ">= 5.0"
   gem.add_runtime_dependency "gems", "~> 1.2"
-  gem.add_runtime_dependency "google-apis-core", "~> 0.1"
-  gem.add_runtime_dependency "google-apis-discovery_v1", "~> 0.0"
+  gem.add_runtime_dependency "google-apis-core", ">= 0.4", "< 2.a"
+  gem.add_runtime_dependency "google-apis-discovery_v1", "~> 0.5"
   gem.add_runtime_dependency "thor", ">= 0.20", "< 2.a"
 end

google-apis-generator/lib/google/apis/generator/templates/gemspec.tmpl

@@ -28,5 +28,5 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
 
   gem.required_ruby_version = '>= 2.5'
-  gem.add_runtime_dependency "google-apis-core", ">= 0.3", "< 2.a"
+  gem.add_runtime_dependency "google-apis-core", ">= 0.4", "< 2.a"
 end