Fixed a deprecation warning from RSpec and added a newline to

spec_helper.rb.

Author: DavidEGrayson

spec/prime_field_spec.rb

@@ -21,7 +21,7 @@
   describe '#mod' do
     it 'returns the integer modulo the prime' do
       n = double('num')
-      n.should_receive(:%).with(prime).and_return(4)
+      expect(n).to receive(:%).with(prime).and_return(4)
       expect(field.mod(n)).to eq 4
     end
   end

spec/spec_helper.rb

@@ -14,4 +14,4 @@
   g: [0, 0x5455],
   n: 0x7efb,
   h: 2,
-)
+)