Update Travis to test up to 3.10

.travis.yml

@@ -1,8 +1,11 @@
 language: python
+dist: bionic
 python:
 - '3.6'
 - '3.7'
 - '3.8'
+- '3.9'
+- '3.10.1'
 install:
 - pip install -U -r requirements.txt
 - pip install -U -r test_requirements.txt

requirements.txt

@@ -1,6 +1,6 @@
 toolz==0.10.0
 pint==0.10
-sphinx==4.0.1
+sphinx==4.3.0
 sphinxcontrib-apidoc==0.3.0
-sphinx-rtd-theme==0.5.2
+sphinx-rtd-theme==1.0.0
 deprecation==2.0.7

setup.py

@@ -2,7 +2,7 @@
 
 
 setup(name='gemd',
-      version='1.8.0',
+      version='1.8.1',
       url='http://github.com/CitrineInformatics/gemd-python',
       description="Python binding for Citrine's GEMD data model",
       author='Citrine Informatics',
@@ -18,20 +18,21 @@
           ]
       },
       install_requires=[
-          "toolz",
-          "pytest>=4.3",
-          "pint>=0.10",
+          "toolz>=0.10.0,<1",
+          "pint>=0.10,<1",
           "deprecation>=2.0.7,<3"
       ],
       extras_require={
           "tests": [
-              "pytest"
+              "pytest>=6.2.5,<7"
           ]
       },
       classifiers=[
           'Programming Language :: Python :: 3',
           'Programming Language :: Python :: 3.6',
           'Programming Language :: Python :: 3.7',
           'Programming Language :: Python :: 3.8',
+          'Programming Language :: Python :: 3.9',
+          'Programming Language :: Python :: 3.10',
       ],
       )

test_requirements.txt

@@ -1,7 +1,7 @@
 flake8==3.7.8
 flake8-docstrings==1.3.1
-pytest==4.3.1
+pytest==6.2.5
 pydocstyle==3.0.0
-pytest-cov==2.7.1
+pytest-cov==3.0.0
 pytest-flake8==1.0.4
-pandas==1.0.3
+pandas>=1.1.5,<2