Typo in the readme sample code

[wphtech]

On the readme file, under the synopsis, the following line error-out for me

diff "abcdefg\nbcdef","abcd\nbcdef", output-style => Context
===SORRY!=== Error while compiling:
Undeclared name:
Context used at line 1

I think it should have Context quoted like the following one.

diff "abcdefg\nbcdef","abcd\nbcdef", output-style => 'Context'
*** A
--- B

---

*** 1,1 ****
! abcdefg
bcdef
--- 1,1 ----
! abcd
bcdef