Fix the grammar in readme.

[kumarankit1234]

1. Fix a small grammar mistake in the Readme.

[codecov-io]

Codecov Report

Merging #971 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #971   +/-   ##
=======================================
  Coverage   89.06%   89.06%           
=======================================
  Files          30       30           
  Lines         741      741           
  Branches      168      168           
=======================================
  Hits          660      660           
  Misses         67       67           
  Partials       14       14

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c5c05e7...64b6870. Read the comment docs.

[theKashey]

👍