Replace all underscores of environment variables

[brayunm]

TLDR A string.replace will only replace the first hit, using a global regex it replaces all hits.

Description Hi, When working with this library and looking at the README I saw that the process environment variables can be used. In the docs it says SONAR_LOG_LEVEL will be transformed to sonar.log.level, right now it seems to be transformed to sonar.log_level. This seems to be due to a string.replace using a string to find the underscore(s) which results in only the first underscore to be replaced

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