upgrade python covidcast version + add api key to python chunk in blog

Author: minhkhul

content/blog/2020-08-28-api.Rmd

@@ -398,6 +398,11 @@ According to the `r blogdown::shortcode_html("apireflink", "api/covidcast-signal
 this is the `fb-survey` data source's `smoothed_hh_cmnty_cli` signal.
 (Click the "Code" button to see the Python code used to produce this example.)
 
+```{python, include = FALSE}
+import covidcast
+import os
+covidcast.use_api_key(os.environ['API_KEY'])
+```
 ```{python python-data, dev='svg'}
 import covidcast
 from datetime import date

environment.yml

@@ -62,4 +62,4 @@ dependencies:
   - matplotlib
   - udunits2
   - pip:
-      - covidcast==0.1.3
+      - covidcast