Release version 1.3.0 about elixometer HOT 5 CLOSED

A new exometer_core has been released with required changes, and published on hex as v1.5.2. However it's setup dependency fails to build.

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The reason to fail build looks like Makefile missing in setup package, see uwiger/setup#41

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master now supports exometer_core 1.4 and 1.5 but:

We override exometer's lager dependency for OTP 19+ compatibility, and we can't build a hex.pm package until we remove the override.

Unfortunately to support 1.5 we needed to override another dependency, setup.

To resolve the setup override we need to handle a compiling issue when using the current hex package at uwiger/setup#44. Once this is resolved it will mean a new setup version, likely 1.8.5. Unfortunately exometer_core pins exact version 1.8.4, so we would also need a new release of exometer_core pointing to the new setup version as well. This would move our version requirement to "~> 1.4.0 or ~> 1.5.3 or ~> 1.6" as 1.4.0 pins a different version (1.7.0) of setup.

To resolve the lager override we would either need to drop support for 1.4 (cc @nichochar) or backport the lager fix to an exometer_core 1.4.1. Note that 1.5 introduced a breaking change in Feuerlabs/exometer_core@7a3c1ba and Feuerlabs/exometer_core@9010438. I have not investigated if these changes are likely to hit users or not. This would move our requirement to "~> 1.4.1 or ~> 1.5.3 or ~> 1.6", forcing at least a patch version update on users when they upgrade.

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Requiring exometer_core ~> 1.5.2 or ~> 1.6 would ensure no one hits #77.

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Version 1.3.0-RC1 has been released: https://hex.pm/packages/elixometer/1.3.0-rc1

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