updated requirements to get flake8 pytest plugin working

jobs/desktop-mobile-mau-2020/mobile_mau/mobile_mau.py

@@ -186,13 +186,13 @@ def create_plot(platform, y_min, y_max, actuals, forecast, plot_start_date, slic
         # autosize=force_width is None,
         # width=force_width,
         # height=force_height,
-        title="""
-        <b>{} {} MAU</b> <span style="font-size: medium;">at end of day {}</span>
+        title="""\
+        <b>{} {} MAU</b> <span style="font-size: medium;">at end of day {}</span>\
         """.format(
             slice_name,
             platform,
             data_end_date,
-        ),
+        ).strip(),
         titlefont={
             "size": 24,
         },

jobs/desktop-mobile-mau-2020/requirements.txt

@@ -3,6 +3,7 @@ google-cloud-bigquery==1.27.2
 google-cloud-bigquery-storage==1.0.0
 google-cloud-storage==1.31.0
 Jinja2==2.11.3
+flake8==3.8.4
 matplotlib==3.3.2
 numpy==1.19.2
 pandas==1.1.2