Bump version to v1.0

[giordano]

Also slightly reorganise CI:

• move FreeBSD to Travis
• move aarch64 to Drone and enable testing also on armv7l
• remove Windows from Travis, it's already running on AppVeyor
• test only on 64-bit systems on Travis, the setting for 32-bit doesn't seem to work anyway
• decrease frequency of TagBot to once per day
• add CompatHelper

[codecov-io]

Codecov Report

Merging #108 into master will decrease coverage by 3.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #108      +/-   ##
=========================================
- Coverage    6.99%   3.90%   -3.10%     
=========================================
  Files         189     189              
  Lines        5348    9586    +4238     
=========================================
  Hits          374     374              
- Misses       4974    9212    +4238     

Impacted Files	Coverage Δ
src/gen/direct_wrappers/gsl_roots_h.jl	47.82% <0.00%> (-16.88%)	⬇️
src/gen/direct_wrappers/gsl_errno_h.jl	33.33% <0.00%> (-16.67%)	⬇️
src/gen/direct_wrappers/gsl_sf_dawson_h.jl	33.33% <0.00%> (-16.67%)	⬇️
src/gen/direct_wrappers/gsl_multiroots_h.jl	52.00% <0.00%> (-16.43%)	⬇️
src/gen/direct_wrappers/gsl_interp_h.jl	18.75% <0.00%> (-12.83%)	⬇️
src/gen/direct_wrappers/gsl_sf_hyperg_h.jl	14.70% <0.00%> (-8.03%)	⬇️
src/gen/direct_wrappers/gsl_rng_h.jl	9.09% <0.00%> (-7.58%)	⬇️
src/gen/direct_wrappers/gsl_sf_erf_h.jl	9.09% <0.00%> (-7.58%)	⬇️
src/gen/direct_wrappers/gsl_sf_bessel_h.jl	8.60% <0.00%> (-7.24%)	⬇️
src/gen/direct_wrappers/gsl_vector_double_h.jl	5.74% <0.00%> (-5.13%)	⬇️
... and 173 more

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