encode complex types as "%+v"

[melekes]

Refs #18

[melekes]

BEFORE:
BenchmarkTMLoggerSimple-2                 200000              5830 ns/op             752 B/op       17 allocs/op
BenchmarkTMLoggerContextual-2             200000              6399 ns/op            1104 B/op       23 allocs/op
BenchmarkTMFmtLoggerSimple-2              300000              4953 ns/op             273 B/op        9 allocs/op
BenchmarkTMFmtLoggerContextual-2          300000              5384 ns/op             481 B/op       13 allocs/op

AFTER:
BenchmarkTMLoggerSimple-2                 200000              5845 ns/op             752 B/op       17 allocs/op
BenchmarkTMLoggerContextual-2             200000              6346 ns/op            1104 B/op       23 allocs/op
BenchmarkTMFmtLoggerSimple-2              300000              4990 ns/op             273 B/op        9 allocs/op
BenchmarkTMFmtLoggerContextual-2          200000              5577 ns/op             481 B/op       13 allocs/op

[codecov-io]

Codecov Report

Merging #77 into develop will decrease coverage by 0.03%.
The diff coverage is 75%.

@@             Coverage Diff             @@
##           develop      #77      +/-   ##
===========================================
- Coverage    57.17%   57.13%   -0.04%     
===========================================
  Files           49       49              
  Lines         4318     4321       +3     
===========================================
  Hits          2469     2469              
- Misses        1669     1671       +2     
- Partials       180      181       +1

Impacted Files	Coverage Δ
log/tmfmt_logger.go	80% <75%> (-3.88%)	⬇️

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[ebuchman]

Nice!