Rename SizeExceeded EvictionReason to MaxEntriesExceeded

[erni27]

This PR renames EvictionReasonSizeExceeded to EvictionReasonMaxEntriesExceeded.

It makes the API more consistent.

[codecov-commenter]

Codecov Report

Merging #28 (98f6a84) into master (2f1b283) will not change coverage.
The diff coverage is 50.00%.

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@@           Coverage Diff           @@
##           master      #28   +/-   ##
=======================================
  Coverage   94.94%   94.94%           
=======================================
  Files           9        9           
  Lines         514      514           
=======================================
  Hits          488      488           
  Misses         22       22           
  Partials        4        4           

Impacted Files	Coverage Δ
eviction.go	0.00% <0.00%> (ø)
expiration.go	100.00% <ø> (ø)
option.go	100.00% <ø> (ø)
cache.go	96.30% <100.00%> (ø)

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[erni27]

Code coverage patch target not satisfied because there is no test for EvictionReason Stringer implementation. I don't think they bring any value.