First two missing instances

[travisbrown]

Congrats to my colleague @CremboC on finding the first instance that didn't make it into implicit scope:

scala> cats.Semigroup[Map[String, List[Int]]]
                     ^
       error: could not find implicit value for parameter ev: cats.kernel.Semigroup[Map[String,List[Int]]]

This affects any map where the element type doesn't have a commutative semigroup. Pre-2.2.0-M1 usage continues to work fine in 2.2.0-M1, you just need at least the cats.kernel.instances.map._ import.

I've also added a missing Align[Stream] on 2.12, which was turned up in #3378.

I'll give us a couple of days to find any more of these (and maybe fix #3377) and then publish a second milestone.

[codecov-io]

Codecov Report

Merging #3380 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3380      +/-   ##
==========================================
- Coverage    91.2%   91.18%   -0.02%     
==========================================
  Files         373      378       +5     
  Lines        7683     7956     +273     
  Branches      197      227      +30     
==========================================
+ Hits         7007     7255     +248     
- Misses        676      701      +25

Flag	Coverage Δ
#scala_version_212	?
#scala_version_213	91.18% <100%> (?)

Impacted Files	Coverage Δ
kernel/src/main/scala/cats/kernel/Semigroup.scala	33.33% <100%> (+3.92%)	⬆️
core/src/main/scala/cats/data/OneAnd.scala	79.1% <0%> (-16.49%)	⬇️
core/src/main/scala/cats/Reducible.scala	97.22% <0%> (-2.78%)	⬇️
core/src/main/scala/cats/syntax/either.scala	81.61% <0%> (-1.72%)	⬇️
...rc/main/scala/cats/laws/discipline/arbitrary.scala	98.29% <0%> (-0.86%)	⬇️
core/src/main/scala/cats/data/Tuple2K.scala	91.3% <0%> (-0.19%)	⬇️
core/src/main/scala/cats/instances/try.scala	96.61% <0%> (-0.12%)	⬇️
.../src/main/scala/cats/laws/discipline/MiniInt.scala	97.22% <0%> (-0.08%)	⬇️
core/src/main/scala/cats/data/NonEmptyChain.scala	92.92% <0%> (-0.08%)	⬇️
core/src/main/scala/cats/data/Ior.scala	98.49% <0%> (-0.04%)	⬇️
... and 25 more

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[rossabaker]

👍