Fix linter errors.

contracts/exchange/contracts/src/MixinExchangeCore.sol

@@ -349,15 +349,16 @@ contract MixinExchangeCore is
 
         // Validate Maker signature (check only if first time seen)
         if (orderInfo.orderTakerAssetFilledAmount == 0) {
-             if (!isValidSignature(
-                     orderInfo.orderHash,
-                     order.makerAddress,
-                     signature)) {
-                 rrevert(SignatureError(
-                     orderInfo.orderHash,
-                     SignatureErrorCodes.BAD_SIGNATURE
-                 ));
-             }
+            if (!isValidSignature(
+                    orderInfo.orderHash,
+                    order.makerAddress,
+                    signature
+                )) {
+                rrevert(SignatureError(
+                    orderInfo.orderHash,
+                    SignatureErrorCodes.BAD_SIGNATURE
+                ));
+            }
         }
     }
 

contracts/utils/contracts/src/RichErrors.sol

@@ -40,8 +40,6 @@ contract RichErrors is
         );
     }
 
-    // solhint-enable func-name-mixedcase
-
     /// @dev Reverts an encoded rich revert reason `errorData`.
     /// @param errorData ABI encoded error data.
     function rrevert(bytes memory errorData)

contracts/utils/contracts/src/mixins/MRichErrors.sol

@@ -18,6 +18,7 @@
 
 pragma solidity ^0.5.5;
 
+
 contract MRichErrors {
     // solhint-disable func-name-mixedcase
 
@@ -31,8 +32,6 @@ contract MRichErrors {
         pure
         returns (bytes memory);
 
-    // solhint-enable func-name-mixedcase
-
     /// @dev Reverts an encoded rich revert reason `errorData`.
     /// @param errorData ABI encoded error data.
     function rrevert(bytes memory errorData)

packages/utils/src/rich_reverts.ts

@@ -46,7 +46,7 @@ export function decodeRichRevertReason(bytes: string | Buffer): RichRevertReason
  */
 export abstract class RichRevertReason {
     // Map of types registered via `registerType`.
-    private static _typeRegistry: ObjectMap<RichRevertReasonRegistryItem> = {};
+    private static readonly _typeRegistry: ObjectMap<RichRevertReasonRegistryItem> = {};
     public abi: RichRevertAbi;
     public values: ValueMap = {};