Change erc165 to pure.

[MoMannn]

[codecov-commenter]

Codecov Report

Merging #292 (1bf39a5) into master (198dec9) will increase coverage by 0.01%. The diff coverage is 93.75%.

@@            Coverage Diff             @@
##           master     #292      +/-   ##
==========================================
+ Coverage   82.70%   82.71%   +0.01%     
==========================================
  Files          18       17       -1     
  Lines         237      243       +6     
  Branches       25       29       +4     
==========================================
+ Hits          196      201       +5     
- Misses         41       42       +1     

Flag	Coverage Δ
unittests	82.71% <93.75%> (+0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...tracts/mocks/nf-token-metadata-enumerable-mock.sol	70.83% <75.00%> (+0.83%)	:arrow_up:
src/contracts/tokens/nf-token-enumerable.sol	100.00% <100.00%> (ø)
src/contracts/tokens/nf-token-metadata.sol	100.00% <100.00%> (ø)
src/contracts/tokens/nf-token.sol	100.00% <100.00%> (ø)

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