Update CI badge to reflect new repository

Author: lemire

README.md

@@ -1,7 +1,6 @@
 MaskedVByte
 ===========
-[![Ubuntu 22.04 CI (GCC 11)](https://github.com/lemire/MaskedVByte/actions/workflows/ubuntu.yml/badge.svg)](https://github.com/lemire/MaskedVByte/actions/workflows/ubuntu.yml)
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+[![Ubuntu](https://github.com/fast-pack/MaskedVByte/actions/workflows/ubuntu.yml/badge.svg)](https://github.com/fast-pack/MaskedVByte/actions/workflows/ubuntu.yml)
 
 Fast decoder for VByte-compressed integers in C.