Cgarch

[RichardMM]

This improves the starting values for cgarch and adds the example notebook

[codecov-io]

Codecov Report

Merging #3 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage   97.17%   97.18%   +<.01%     
==========================================
  Files          33       33              
  Lines        8503     8512       +9     
  Branches      771      772       +1     
==========================================
+ Hits         8263     8272       +9     
  Misses        150      150              
  Partials       90       90

Impacted Files	Coverage Δ
arch/univariate/base.py	93.11% <ø> (ø)	⬆️
arch/univariate/mean.py	92.96% <ø> (ø)	⬆️
arch/univariate/volatility.py	96.07% <100%> (+0.03%)	⬆️
arch/tests/univariate/test_volatility.py	99.75% <100%> (ø)	⬆️

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[coveralls]

Coverage increased (+0.01%) to 98.25% when pulling 7f2c208 on cgarch into 8d00212 on master.

[coveralls]

Coverage increased (+0.01%) to 98.25% when pulling 7f2c208 on cgarch into 8d00212 on master.

[coveralls]

Coverage increased (+0.01%) to 98.25% when pulling 7f2c208 on cgarch into 8d00212 on master.

[coveralls]

Coverage increased (+0.002%) to 98.238% when pulling feef7e1 on cgarch into 8d00212 on master.

[coveralls]

Coverage increased (+0.002%) to 98.238% when pulling 0df4501 on cgarch into 8d00212 on master.