updates testing to 2020.11

.travis.yml

@@ -11,11 +11,13 @@ before_install:
   - conda update -q conda
   - conda info -a
 install:
-  - wget -q https://raw.githubusercontent.com/qiime2/environment-files/master/latest/staging/qiime2-latest-py36-linux-conda.yml
-  - conda env create -q -n test-env --file qiime2-latest-py36-linux-conda.yml
+  - wget -q https://data.qiime2.org/distro/core/qiime2-2020.11-py36-linux-conda.yml
+  - conda env create -q -n test-env --file qiime2-2020.11-py36-linux-conda.yml
   - source activate test-env
-  - conda install -q pytest-cov regex dask=2.20
+  - conda install -q -y pytest-cov regex dask
+  - conda install -q -y -c conda-forge -c bioconda -c qiime2 -c defaults xmltodict
   - pip install -q flake8 coveralls
+  - pip install -q git+https://github.com/bokulich-lab/RESCRIPt.git
   - pip install -q https://github.com/qiime2/q2lint/archive/master.zip
   - pip install . --no-deps
   - make install