Store dates in UTC but print them in local time

[iamed2]

• Adds TimeZones as a dependency
• Stores dates in DefaultRecords as UTC
• Adds an output_tz field to DefaultFormatter which defaults to localzone
• Adds special path to handle formatting dates which prints ZonedDateTimes in local time and DateTimes as they are
• Modifies date printing format to use space instead of "T" and print only second-level precision

[codecov[bot]]

Codecov Report

Merging #94 into master will decrease coverage by 1.04%. The diff coverage is 62.5%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
- Coverage   98.92%   97.87%   -1.05%     
==========================================
  Files          11       11              
  Lines         278      283       +5     
==========================================
+ Hits          275      277       +2     
- Misses          3        6       +3

Impacted Files	Coverage Δ
src/Memento.jl	100% <ø> (ø)	:arrow_up:
src/records.jl	100% <100%> (ø)	:arrow_up:
src/formatters.jl	94% <57.14%> (-6%)	:arrow_down:

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[rofinn]

Hmmm, is the coverage drop just continued issues with coverage reporting?

[ararslan]

Yeah, looking at the Codecov report on their website, the change in coverage looks bogus.

[iamed2]

Yeah it's unfortunate but I can't see how this isn't just a random bug. Unrelated to previous issues though, as those were about 0.7 reporting bad coverage.

[rofinn]

Okay, this looks good to me.