fixed string formatting errors

[hedin-hiervard]

Prevented the logger to work in Godot 3.1.alpha1

[mitchcurtis]

So is this project dead? Should I use your repo instead, @hedin-hiervard?

I get a bunch of errors after setting this to autoload (which seem to be fixed with your patches):

res://3rdparty/logger/logger.gd:382 - Parse Error: Too many arguments for 'warn()' call. Expected at most 2.
modules/gdscript/gdscript.cpp:580 - Method/Function Failed, returning: ERR_PARSE_ERROR
Script does not inherit a Node: res://3rdparty/logger/logger.gd
editor/editor_autoload_settings.cpp:448 - Condition ' !info->node ' is true. Continuing..:
Add AutoLoad
res://3rdparty/logger/logger.gd:382 - Parse Error: Too many arguments for 'warn()' call. Expected at most 2.
modules/gdscript/gdscript.cpp:580 - Method/Function Failed, returning: ERR_PARSE_ERROR

[hedin-hiervard]

Feel free to use and contribute. I use this
fork for my game Dwarven Skykeep.

[akien-mga]

The first two commits look good, but the rest should go in separate PRs, as they're unrelated to fixing string formatting.

The third commit also breaks compatibility by changing the names of the logging levels in a seemingly arbitrary manner, so this would need discussion.

[SirMoM]

I think this can be closed since the errors of this PR are already resolved in #8.

[akien-mga]

Closing as superseded by later PRs. Thanks for the contribution!