Revert to scala 2.12.9 and ignore MiMa false positives

[regadas]

See for more context: lightbend-labs/mima#388

[regadas]

This is not pretty but I guess we will be able to remove this once that issue is fixed

[johnynek]

@regadas This seems fine to get things green for a release, but I think we should revert it after the next publish. What do you think?

[regadas]

@johnynek sounds good! 👍

[regadas]

flaky tut?

[johnynek]

I'll rerun but :(run-main-0) java.lang.NoSuchMethodError: scala.reflect.internal.util.ReusableInstance.<init>(Lscala/Function0;)V doesn't look flakey. It looks like binary incompatibility.

Maybe tut isn't compatible with one of these version bumps?

maybe an sbt caching bug?

[regadas]

Oh! I missed that! I'll have a look.

[johnynek]

Maybe we should revert the 2.12 bump. Master is red now and it caused all the scala steward bumps to fail.

[regadas]

Yup agreed! yesterday I tracked this a bit and I think there's something fishy around tut and 2.12.10 repl interpreter that it's instantiated; seems that the classpath is not right.

2.12.9 is ok I'll push a commit here to double check.

[codecov-io]

Codecov Report

Merging #682 into develop will increase coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #682      +/-   ##
===========================================
+ Coverage     89.5%   89.58%   +0.08%     
===========================================
  Files          112      112              
  Lines         8943     8943              
  Branches       314      314              
===========================================
+ Hits          8004     8012       +8     
+ Misses         939      931       -8

Impacted Files	Coverage Δ
.../main/scala/com/twitter/algebird/Successible.scala	87.5% <0%> (-4.17%)	⬇️
.../main/scala/com/twitter/algebird/BloomFilter.scala	93.8% <0%> (-0.45%)	⬇️
.../main/scala/com/twitter/algebird/Approximate.scala	90.32% <0%> (+1.61%)	⬆️
...main/scala/com/twitter/algebird/monad/Reader.scala	55.55% <0%> (+5.55%)	⬆️
...src/main/scala/com/twitter/algebird/Interval.scala	85.21% <0%> (+6.95%)	⬆️

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