New Source: East Riding, UK (#1016)

* initial commit

* test cases added

* typos corrected

* eastriding .md added

* update_docu_link run

doc/source/eastriding_gov_uk.md

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+# East Riding of Yorkshire Council
+
+Support for schedules provided by [East Riding of Yorkshire Council](https://eastriding.gov.uk), UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: eastriding_gov_uk
+      args:
+        postcode: POSTCODE
+        uprn: UNIQUE_PROPERTY_REFERENCE_NUMBER
+```
+
+### Configuration Variables
+
+**postcode**</br>
+*(string) (required)*
+
+**uprn**</br>
+*(string) (required)*
+
+
+## Example
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: eastriding_gov_uk
+      args:
+        postcode: "DN14 6BJ"
+        uprn: "010002364380"
+```
+
+#### How to find your `UPRN`
+You can discover your Unique Property Reference Number (UPRN) is by going to https://www.findmyaddress.co.uk/ and entering in your address details.
+
+
+