Update installing-protoc.md : Added Proper ZIP file name

[lahiri-phdworks]

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[lahiri-phdworks]

@googlebot I signed it!

@googlebot I signed it!

[blackgnezdo]

Thanks for the fix!

[blackgnezdo]

@judah, I don't see a way to merge this nor a link to the launched build. Did Travis even get triggered?

[lahiri-phdworks]

Yeah, a Travis build was triggered.
https://travis-ci.com/github/lahiri-phdworks/proto-lens/builds/204571293
Strange that it isn't reflecting here. Did I miss out on something?