Merge branch 'add_cwg'

add Cristoph Groth as 'adaptive' author.

See merge request !53

AUTHORS.md

 # Adaptive Authors
-Below is a list of the main contributors to Adaptive:
+Below is a list of the contributors to Adaptive:
 
 + [Anton Akhmerov](<https://antonakhmerov.org>)
++ [Christoph Groth](<http://inac.cea.fr/Pisp/christoph.groth/>)
 + [Bas Nijholt](<http://nijho.lt>)
 + [Joseph Weston](<https://joseph.weston.cloud>)
 

README.md

@@ -92,7 +92,6 @@ in the repository.
 ## Credits
 We would like to give credits to the following people:
 - Pedro Gonnet for his implementation of [`CQUAD`](https://www.gnu.org/software/gsl/manual/html_node/CQUAD-doubly_002dadaptive-integration.html), "Algorithm 4" as described in "Increasing the Reliability of Adaptive Quadrature Using Explicit Interpolants", P. Gonnet, ACM Transactions on Mathematical Software, 37 (3), art. no. 26, 2010.
-- Christoph Groth for his Python implementation of [`CQUAD`](https://gitlab.kwant-project.org/cwg/python-cquad) which served as basis for the [`IntegratorLearner`](adaptive/learner/integrator_learner.py).
 - Pauli Virtanen for his `AdaptiveTriSampling` script (no longer available online since SciPy Central went down) which served as inspiration for the [`Learner2D`](adaptive/learner/learner2D.py).
 
 For general discussion, we have a [Gitter chat channel](https://gitter.im/python-adaptive/adaptive). If you find any bugs or have any feature suggestions please file a GitLab [issue](https://gitlab.kwant-project.org/qt/adaptive/issues/new?issue) or submit a [merge request](https://gitlab.kwant-project.org/qt/adaptive/merge_requests).

adaptive/learner/integrator_coeffs.py

 # -*- coding: utf-8 -*-
-# Copyright 2017 Christoph Groth
-# Copyright 2017 `adaptive` authors
+# Based on an adaptive quadrature algorithm by Pedro Gonnet
 
 from fractions import Fraction
 from collections import defaultdict

adaptive/learner/integrator_learner.py

 # -*- coding: utf-8 -*-
-# Copyright 2010 Pedro Gonnet
-# Copyright 2017 Christoph Groth
-# Copyright 2017 `adaptive` authors
+# Based on an adaptive quadrature algorithm by Pedro Gonnet
 
 from collections import defaultdict
 from math import sqrt