add: identity renounce claimer function

contracts/identity/Identity.sol

@@ -55,12 +55,11 @@ contract Identity is IdentityAdminRole, SchemeGuard {
         onlyRegistered
         onlyIdentityAdmin
     {
-        claimers.remove(account);
-
-        decreaseClaimerCount(1);
-        delete dateAdded[account];
+        _removeClaimer(account);
+    }
 
-        emit ClaimerRemoved(account);
+    function renounceClaimer() public {
+        _removeClaimer(msg.sender);
     }
 
     /* @dev Reverts if given address has not been added to claimers
@@ -116,6 +115,15 @@ contract Identity is IdentityAdminRole, SchemeGuard {
         emit BlacklistRemoved(account);
     }
 
+    function _removeClaimer(address account) internal {
+        claimers.remove(account);
+
+        decreaseClaimerCount(1);
+        delete dateAdded[account];
+
+        emit ClaimerRemoved(account);
+    }
+
     /* @dev Reverts if given address has been added to the blacklist
      * @param account the address to check
      * @return a bool indicating weather the address is present in the blacklist

test/Identity.test.ts

@@ -242,6 +242,13 @@ contract("Identity - Blacklist and Claimer", ([founder, blacklisted, blacklisted
         await identity.removeClaimer(claimer);
     });
 
+    it("should renounce claimer", async () => {
+        await identity.addClaimer(claimer);
+        assert(await identity.isClaimer(claimer));
+        await identity.renounceClaimer({ from: claimer });
+        assert(!(await identity.isClaimer(claimer)));
+    })
+
     it("should not allow setting non-registered identity contract", async () => {
         await helpers.assertVMException(identityGuard.setIdentity(dangerIdentity.address, avatar.address), "Scheme is not registered");
         dangerIdentity = await Identity.new();