allegro / bigcache / 302

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travis-ci

replace EntryNotFoundError on ErrEntryNotFound (#111)

I reconsidered my approach to `EntryNotFoundError` error. User always knows what key he uses, so we can delete `EntryNotFoundError` structure and replace it to `ErrEntryNotFound`


```
benchmark                                                old ns/op     new ns/op     delta
BenchmarkReadFromCacheNonExistentKeys/1-shards-12        185           181           -2.16%
BenchmarkReadFromCacheNonExistentKeys/512-shards-12      182           179           -1.65%
BenchmarkReadFromCacheNonExistentKeys/1024-shards-12     184           180           -2.17%
BenchmarkReadFromCacheNonExistentKeys/8192-shards-12     182           176           -3.30%

benchmark                                                old allocs     new allocs     delta
BenchmarkReadFromCacheNonExistentKeys/1-shards-12        1              0              -100.00%
BenchmarkReadFromCacheNonExistentKeys/512-shards-12      1              0              -100.00%
BenchmarkReadFromCacheNonExistentKeys/1024-shards-12     1              0              -100.00%
BenchmarkReadFromCacheNonExistentKeys/8192-shards-12     1              0              -100.00%

benchmark                                                old bytes     new bytes     delta
BenchmarkReadFromCacheNonExistentKeys/1-shards-12        24            8             -66.67%
BenchmarkReadFromCacheNonExistentKeys/512-shards-12      23            7             -69.57%
BenchmarkReadFromCacheNonExistentKeys/1024-shards-12     24            8             -66.67%
BenchmarkReadFromCacheNonExistentKeys/8192-shards-12     23            7             -69.57%
```

3 of 3 new or added lines in 1 file covered. (100.0%)

653 of 735 relevant lines covered (88.84%)

184742.28 hits per line