Update README.md

Author: PetrHeinz

README.md

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 # packagist-version-test
 
-Repos made for testing versions in format SERIES.MAJOR.MINOR.PATCH, eg. 7.1.0.0
+Repo made for testing versions in format SERIES.MAJOR.MINOR.PATCH, eg. 7.1.0.0
 
 Tested using a package `petr-heinz/packagist-version-test` registered on Packagist and [semver.mwl.be](https://semver.mwl.be/#?package=petr-heinz%2Fpackagist-version-test).