4.0.0 Release

[nblumhardt]

Breaking changes

• 194 - switch from instrumentationKey to connectionString (@zyofeng)

To migrate, change any references to instrumentationKey to connectionString instead (including in JSON configuration). Discussion in #163.

Other changes

• 160 - update README with information about deprecated TelemetryConfiguration.Active (@dglozano, @vany0114 )

• 169 - build and packaging updates (@nblumhardt)

• 171 - point build badge to dev (@nblumhardt)

• 148 - update Application Insights dependency (@RiverPhillips)

• 185, #199 - CI/publishing updates (@nblumhardt)

• 159 - LoggingLevelSwitch support (@jotabe-net)

• 186 - fix string escaping (@cmeeren)

• 187 - update to C# 10 (@nblumhardt)

• 188 - don't JSON-encode the contents of string literal properties (@nblumhardt)

• 190 - add tests verifying property formatting (@cmeeren)

• 193 - updated README to clarify Azure Functions usage (@zyofeng)

Thanks

Extra thanks to everyone who contributed to this release! It's been a rather drawn-out and awkward one, with a lot of changes sitting on dev for an extended period of time while we figured out the way forwards (and thanks also to everyone who had input into that!).