Improve README file

[charleswhchan]

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[codecov-io]

Codecov Report

Merging #950 into master will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #950      +/-   ##
==========================================
- Coverage   53.23%   53.06%   -0.18%     
==========================================
  Files          40       40              
  Lines        3999     3969      -30     
==========================================
- Hits         2129     2106      -23     
+ Misses       1672     1667       -5     
+ Partials      198      196       -2

Impacted Files	Coverage Δ
runtime/mux.go	53.22% <0%> (-2.16%)	⬇️
protoc-gen-grpc-gateway/gengateway/template.go	65.51% <0%> (-1.52%)	⬇️
runtime/pattern.go	91.42% <0%> (+1.04%)	⬆️
protoc-gen-grpc-gateway/descriptor/registry.go	59.82% <0%> (+1.04%)	⬆️

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[johanbrandhorst]

Thanks for this contribution! Just one small point.

[googlebot]

So there's good news and bad news.

👍 The good news is that everyone that needs to sign a CLA (the pull request submitter and all commit authors) have done so. Everything is all good there.

😕 The bad news is that it appears that one or more commits were authored or co-authored by someone other than the pull request submitter. We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that here in the pull request.

Note to project maintainer: This is a terminal state, meaning the cla/google commit status will not change from this state. It's up to you to confirm consent of all the commit author(s), set the cla label to yes (if enabled on your project), and then merge this pull request when appropriate.

ℹ️ Googlers: Go here for more info.

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.