Update README

Author: ivome

src/estimators/directive/README.md

@@ -64,7 +64,8 @@ input Filter {
 
 The multipliers can be combined. Configured multipliers that don't have a value or `NULL` are ignored. 
 
-Code first approach can use the `createComplexityDirective` function to generate directive definition:
+If you are using the code first approach you can use the `createComplexityDirective` function to create 
+the complexity directive:
 
 ```typescript
 import {createComplexityDirective} from 'graphql-query-complexity';
@@ -78,4 +79,4 @@ const schema = new GraphQLSchema({
   ]
   // ... other config
 });
-```
+```

src/estimators/fieldExtensions/README.md

@@ -64,6 +64,7 @@ The function signature is the same as for the main estimator which lets you reus
 type ComplexityEstimatorArgs = {
   type: GraphQLCompositeType,
   field: GraphQLField<any, any>,
+  node: FieldNode,
   args: {[key: string]: any},
   childComplexity: number
 }