Add vader#assert#diff to describe differences in lists/dicts

[blueyed]

I came up with this when comparing location/quickfix list entries.

It should get renamed probably, and then used by the assertion functions (at least assert_equal itself).

Ref: #120 (comment)

[junegunn]

Sorry for the delay. I had a crazy week and was completely exhausted.

It should get renamed probably, and then used by the assertion functions

Are you planning to do this?

[blueyed]

It should get renamed probably

Any suggestions for a better-fitting name?

[junegunn]

Maybe it's just okay as it is as it's an internal function. We can change it later if we want.

[codecov-io]

Codecov Report

Merging #123 into master will decrease coverage by 3.87%.
The diff coverage is 2.7%.

@@            Coverage Diff            @@
##           master    #123      +/-   ##
=========================================
- Coverage   83.37%   79.5%   -3.88%     
=========================================
  Files          12      12              
  Lines         734     771      +37     
=========================================
+ Hits          612     613       +1     
- Misses        122     158      +36

Flag	Coverage Δ
#nvim	78.98% <2.7%> (-3.85%)	⬇️
#vim	79.24% <2.7%> (-3.86%)	⬇️

Impacted Files	Coverage Δ
autoload/vader/assert.vim	57.3% <2.7%> (-38.86%)	⬇️

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