Update README.md

Author: capnramses

README.md

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 Code samples from the book *Professional Programming Tools for C and C++* by Anton Gerdelan and Katja Žibrek.
 The book information page is at [http://antongerdelan.net/pro_programming_tools_book/](http://antongerdelan.net/pro_programming_tools_book/).
 
-![](img https://github.com/capnramses/pro_programming_tools_c_cpp/workflows/build_all/badge.svg)
+![](https://github.com/capnramses/pro_programming_tools_c_cpp/workflows/build_all/badge.svg)
 
 ## How to use this Repository