update EPA O3 and link

README.rst

@@ -131,7 +131,7 @@ Resources
 =========
 
 * EPA AQI: Technical Assistance Document for the Reporting of Daily Air
-  Quality – the Air Quality Index (AQI) December 2013) found at http://www.epa.gov/airnow/aqi-technical-assistance-document-dec2013.pdf
+  Quality – the Air Quality Index (AQI) December 2018) found at https://www.airnow.gov/sites/default/files/2020-05/aqi-technical-assistance-document-sept2018.pdf
 * National Ambient Air Quality Standards for Particulate Matter found at http://www.gpo.gov/fdsys/pkg/FR-2013-01-15/pdf/2012-30946.pdf
 * MEP AQI:
 

aqi/algos/epa.py

@@ -24,11 +24,11 @@ class AQI(PiecewiseAQI):
             (401, 500)],
         'bp': {
             POLLUTANT_O3_8H: [
-                (Decimal('0.000'), Decimal('0.059')),
-                (Decimal('0.060'), Decimal('0.075')),
-                (Decimal('0.076'), Decimal('0.095')),
-                (Decimal('0.096'), Decimal('0.115')),
-                (Decimal('0.116'), Decimal('0.374')),
+                (Decimal('0.000'), Decimal('0.054')),
+                (Decimal('0.055'), Decimal('0.070')),
+                (Decimal('0.071'), Decimal('0.085')),
+                (Decimal('0.086'), Decimal('0.105')),
+                (Decimal('0.106'), Decimal('0.200')),
             ],
             POLLUTANT_O3_1H: [
                 (0, 0),