Currently, on Windows, only C:\Qt\5.9.9\msvc2017_64\ is considered as a Qt location. This does apparently not work if only some other version such as Qt 5.12.10 is installed. This PR fixes this issue by searching the environment PATH variable for the pattern C:\Qt\5.*\msvc2017_64.
Documentation about Usage in Readme seems to be not up to date - fixed that
C:\Qt\5.9.9\msvc2017_64\is considered as a Qt location. This does apparently not work if only some other version such as Qt 5.12.10 is installed. This PR fixes this issue by searching the environmentPATHvariable for the patternC:\Qt\5.*\msvc2017_64.