Updated OpenSC Release Howto (markdown)

Author: metsma

OpenSC-Release-Howto.md

@@ -32,7 +32,7 @@ Releasing OpenSC should be simple and streamlined, yet a predictable and easily
 Release (or RC) version must be changed in the following files:
 
 * `NEWS`: Make sure to fix the release date for final release!
-* `configure.ac` : change package version major/minor/fix as needed, RCs get the package suffix `-rc`, which is removed for the final release
+* `VERSION.mk` : change package version major/minor/fix as needed, RCs get the package suffix `-rc`, which is removed for the final release
 * `configure.ac` : Update the [LT version number](https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html), which is required with changes to, for example, `opensc.h` and `libopensc.exports`.
 * `.appveyor.yml`: Update the version on first line
 * `README.md`: Update the links to the new release and binaries