Update CI badge

Author: eldruin

README.md

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-[![Build Status](https://travis-ci.org/thejpster/rust-measurements.svg)](https://travis-ci.org/thejpster/rust-measurements)
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 # Type-safe units of measure for Rust
 
+[![Build Status](https://github.com/rust-embedded-community/rust-measurements/workflows/Build/badge.svg)](https://github.com/rust-embedded-community/rust-measurements/actions?query=workflow%3ABuild)
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 ### Why should I care? I already have numbers...
 
 Working with units can be very error prone.