fix File and Dir exists? vs. exist?

spec/args/save_batch_spec.rb

@@ -12,7 +12,7 @@ describe Squib::Args::SaveBatch do
         expect(Squib.logger).to receive(:warn).with("Dir 'tocreate' does not exist, creating it.").once
         save_batch.load! opts
         expect(save_batch).to have_attributes({ dir: ['tocreate'] })
-        expect(Dir.exists? 'tocreate').to be true
+        expect(Dir.exist? 'tocreate').to be true
       end
     end
   end

spec/commands/new_spec.rb

@@ -25,18 +25,18 @@ describe Squib::Commands::New do
 
     it 'creates a basic template on an fresh directory' do
       @cmd.process(['foo'], false)
-      expect(File.exists?('foo/deck.rb')).to be true
+      expect(File.exist?('foo/deck.rb')).to be true
     end
 
     it 'creates an advanced template on an fresh directory' do
       @cmd.process(['foo'], true)
-      expect(File.exists?('foo/src/deck.rb')).to be true
+      expect(File.exist?('foo/src/deck.rb')).to be true
     end
 
     it 'creates a new template on an empty directory' do
       Dir.mkdir('foo')
       @cmd.process(['foo'], false)
-      expect(File.exists?('foo/deck.rb')).to be true
+      expect(File.exist?('foo/deck.rb')).to be true
     end
 
     it 'does not create a new template on an empty ' do