Add configuration requirements for various analyzers

salt/sensoroni/files/analyzers/emailrep/README.md

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+# EmailRep
+
+## Description
+Submit an email address to EmailRepIO for analysis.
+
+## Configuration Requirements
+
+``api_key`` - API key used for communication with the EmailRepIO API
+
+This value should be set in the pillar, like so:
+
+```
+sensoroni:
+  analyzers:
+    emailrep:
+      api_key: $yourapikey
+```