logLevel mismatch between source code and Documentation

[wesbragagt]

Looks like the implementation of SentryModule.forRoot on version 6.17.4 changed on how logLevel is passed. Now it's spelled as logLevels and it receives a type of LogLevel[]. Also the type LogLevel doesn't seem to exist anymore. Documentation needs to be updated in order to avoid type conflicts.

Before:

SentryModule.forRoot({
...
logLevel: LogLevel.Debug
})

Now:

SentryModule.forRoot({
logLevels: ['debug']
})

PR to address this -> #73