fix deprecated messages from std.experimental.ndslice in DMD2.073

[ShigekiKarita]

When I update DMD from 2.072 to 2.073, I got many deprecation messages like

/home/karita/tool/dmd2/linux/bin64/../../src/phobos/std/experimental/ndslice/package.d(315,15): 
Deprecation: module std.experimental.ndslice.slice is deprecated 
- Please use mir-algorithm DUB package: http://github.com/libmir/mir-algorithm

log.txt

According to the messages, I rewrote the lines import std.experimental.ndslice to use mir modules.

[codecov-io]

Current coverage is 96.77% (diff: 100%)

Merging #385 into master will increase coverage by 3.43%

@@             master       #385   diff @@
==========================================
  Files            10         15      +5   
  Lines          1350       3252   +1902   
  Methods           0          0           
  Messages          0          0           
  Branches          0          0           
==========================================
+ Hits           1260       3147   +1887   
- Misses           90        105     +15   
  Partials          0          0           

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[9il]

Thanks!

[9il]

v0.22.1