misc tune to Project.toml

[johnnychen94]

• moves some test-only packages to [extras] section
• slightly simplify the [compat] section
• disable email notification from travis

Each commit is a small but independent change, please merge with squash if you feel them too many.

[codecov]

Codecov Report

Merging #51 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   98.81%   98.81%           
=======================================
  Files          48       48           
  Lines        2107     2107           
=======================================
  Hits         2082     2082           
  Misses         25       25           

Impacted Files	Coverage Δ
src/fbp/sino_geom.jl	100.00% <ø> (ø)
src/plot/jim.jl	100.00% <ø> (ø)

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[JeffFessler]

Note to self: OK because 1.3 means [1.3,2) per
https://julialang.github.io/Pkg.jl/v1/compatibility/

I will merge these after tag for 0.12 goes through.

[JeffFessler]

@johnnychen94 Sorry for the delay.
For some reason my version update is stuck in the Registrator for a long time:
JuliaRegistries/General#17858

Thanks for cleaning up these outdated [deps] entries.
Did you find these by hand or is there some tool that automates it?

[johnnychen94]

Thanks for cleaning up these outdated [deps] entries.
Did you find these by hand or is there some tool that automates it?

Because I am not familiar with MIRT, I simply did a search for every package in Project.toml and checked if this is apparently a test-only dependency....

https://github.com/bcbi/CompatHelper.jl is a tool that sends a PR notification for every new version of every dependency. An example of such PR can be found in JuliaImages/Images.jl#880