Merge branch 'master' into ml-evs/fixes

Pipfile

@@ -6,8 +6,7 @@ verify_ssl = true
 [dev-packages]
 
 [packages]
-python = "*"
-3-5 = "*"
+optimade = {editable = true,path = ".", extras=['server']}
 
 [requires]
 python_version = "3.7"

Procfile

@@ -0,0 +1 @@
+web: uvicorn optimade.server.main:app --host 0.0.0.0 --port $PORT

README.md

@@ -2,7 +2,7 @@
 
 | Latest release | Build status | Activity |
 |:--------------:|:------------:|:--------:|
-| [![PyPI Version](https://img.shields.io/pypi/v/optimade?logo=pypi)](https://pypi.org/project/optimade/) [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/optimade?logo=python)](https://pypi.org/project/optimade/) [![OPTiMaDe](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/Materials-Consortia/optimade-python-tools/master/.ci/optimade-version.json&logo=json)](https://github.com/Materials-Consortia/OPTiMaDe/) | [![Build Status](https://img.shields.io/github/workflow/status/Materials-Consortia/optimade-python-tools/Dependency,%20linting,%20and%20OpenAPI%20validation/gh_action_linter?logo=github)](https://github.com/Materials-Consortia/optimade-python-tools/actions?query=branch%3Amaster+) [![codecov](https://codecov.io/gh/Materials-Consortia/optimade-python-tools/branch/master/graph/badge.svg)](https://codecov.io/gh/Materials-Consortia/optimade-python-tools) | [![Commit Activity](https://img.shields.io/github/commit-activity/m/Materials-Consortia/optimade-python-tools?logo=github)](https://github.com/Materials-Consortia/optimade-python-tools/pulse) |
+| [![PyPI Version](https://img.shields.io/pypi/v/optimade?logo=pypi)](https://pypi.org/project/optimade/) [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/optimade?logo=python)](https://pypi.org/project/optimade/) [![OPTiMaDe](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/Materials-Consortia/optimade-python-tools/master/.ci/optimade-version.json&logo=json)](https://github.com/Materials-Consortia/OPTiMaDe/) | [![Build Status](https://img.shields.io/github/workflow/status/Materials-Consortia/optimade-python-tools/Dependency,%20linting,%20and%20OpenAPI%20validation/gh_action_linter?logo=github)](https://github.com/Materials-Consortia/optimade-python-tools/actions?query=branch%3Amaster+) [![codecov](https://codecov.io/gh/Materials-Consortia/optimade-python-tools/branch/master/graph/badge.svg)](https://codecov.io/gh/Materials-Consortia/optimade-python-tools)[![Heroku](https://heroku-badge.herokuapp.com/?app=optimade&root=optimade/info)](https://optimade.herokuapp.com/optimade/info) | [![Commit Activity](https://img.shields.io/github/commit-activity/m/Materials-Consortia/optimade-python-tools?logo=github)](https://github.com/Materials-Consortia/optimade-python-tools/pulse) |
 
 The aim of OPTiMaDe is to develop a common API, compliant with the [JSON API 1.0](http://jsonapi.org/format/1.0/) specification.
 This is to enable interoperability among databases that contain calculated properties of existing and hypothetical materials.