v7.0.0

• #233 - minimum level configuration improvements (@HexHunter97)
• #301 - support for delegate type arguments (@almostchristian)
• #326 - README improvements (@nblumhardt)
• #333 - extension method discovery that goes easier on Dynatrace (@skomis-mm)
• #334 - case-insensitive level support (@skomis-mm)
• #342 - implicit using and file-scoped namespaces (@sungam3r)
• #344 - clean-up (@sungam3r)
• #351 - drop .NET 4.5.1 support (@0xced)
• #348 - additional IFormatProvider support (@0xced)
• #354, #357 - improve tests using raw string literals (@sungam3r)
• #352 - OnLevelSwitchCreated callback (@0xced)
• #355 - add global.json (@SimonCropp)
• #356 - use Directory.Build.props (@SimonCropp)
• #359 - update test refs (@SimonCropp)
• #360 - remove redundant project settings (@SimonCropp)
• #358 - build on macOS (@SimonCropp)
• #361 - add API approval tests (@sungam3r)
• #362 - support for reading configuration from IConfigurationSection contents (@sungam3r)
• #364 - nullable reference type fixes (@0xced)
• #367 - improve tests using raw string literals (@0xced)
• #369 - more nullable reference type safety (@0xced)
• #363 - allow configuration using internal types and methods (@sungam3r)
• #368 - improve SelfLog output (@sungam3r)
• #375 - fix README example (@DevAlvaroF)
• #377 - pin to Microsoft.Extensions.Configuration v7 (@nblumhardt)
• #353 - improve support for single-file apps (@0xced)
• #379 - simplify assembly loading (@0xced)
• #366 - reader options callback to expose LoggingLevelSwitch (@0xced)
• #380, #381 - fix tests on .NET 4.8 (@0xced)
• #378 - fix error handling in build script (@0xced)