Test with newer Python

.travis.yml

@@ -1,6 +1,8 @@
 language: python
 python:
     - "3.6"
+    - "3.7"
+    - "3.8"
 install:
     - pip install -r docs/requirements.txt
 script: pelican -s docs/pelicanconf.py

docs/pelicanconf.py

@@ -18,6 +18,12 @@ PATH = 'content'
 OUTPUT_PATH = 'blog/'
 TIMEZONE = 'America/New_York'
 
+PLUGIN_PATHS = ['pelican-plugins']
+
+# PLUGINS = ['i18n_subsites']
+
+# JINJA_ENVIRONMENT = {'extensions': ['jinja2.ext.i18n']}
+
 I18N_TEMPLATES_LANG = 'en'
 DEFAULT_LANG = 'en'
 OG_LOCALE = 'en_US'