Modernize: Implement suggestions by rubocop 1.39

- `bundle exec rubocop --autocorrect`
- Add `base64` to dependencies

Author: amotl

Gemfile.lock

@@ -7,6 +7,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.3)
+    base64 (0.3.0)
     diff-lcs (1.6.2)
     json (2.18.1)
     os (1.1.4)
@@ -61,6 +62,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
+  base64
   bundler
   crate_ruby!
   os

crate_ruby.gemspec

@@ -37,7 +37,6 @@ Gem::Specification.new do |spec|
 
   spec.files         = Dir['lib/**/*']
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
-  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = %w[lib]
   spec.extra_rdoc_files = Dir['README.rst', 'CHANGES.rst', 'LICENSE', 'NOTICE']
   spec.rdoc_options    += [
@@ -53,9 +52,11 @@ Gem::Specification.new do |spec|
     'changelog_uri' => 'https://github.com/crate/crate_ruby/blob/main/CHANGES.rst',
     'documentation_uri' => 'https://www.rubydoc.info/gems/crate_ruby',
     'homepage_uri' => spec.homepage,
-    'source_code_uri' => 'https://github.com/crate/crate_ruby'
+    'source_code_uri' => 'https://github.com/crate/crate_ruby',
+    'rubygems_mfa_required' => 'true'
   }
 
+  spec.add_development_dependency 'base64'
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'os'
   spec.add_development_dependency 'rake'

spec/bootstrap.rb

@@ -58,9 +58,7 @@ def download
     Net::HTTP.start(uri.host, uri.port, use_ssl: uri.scheme == 'https') do |http|
       request = Net::HTTP::Get.new uri
       resp = http.request request
-      File.open(@fname, 'wb') do |file|
-        file.write(resp.body)
-      end
+      File.binwrite(@fname, resp.body)
     end
   end
 

spec/crate_ruby/client_spec.rb

@@ -72,9 +72,7 @@
         it 'downloads a blob' do
           data = client.blob_get(blob_table, digest)
           expect(data).to be_truthy
-          File.open(store_location, 'wb') do |file|
-            file.write(data)
-          end
+          File.binwrite(store_location, data)
         end
       end
 
@@ -85,7 +83,8 @@
         end
 
         it 'deletes a blob' do
-          client.blob_delete(blob_table, digest)
+          response = client.blob_delete(blob_table, digest)
+          expect(response).to be_falsy
         end
       end
     end
@@ -95,7 +94,7 @@
 
       before do
         client.execute("create table #{table_name} " \
-           '(id integer primary key, name string, address object, tags array(string)) ')
+                       '(id integer primary key, name string, address object, tags array(string)) ')
       end
 
       after do