Add restriction to minimumBid being at most 1% of market cap. (#569)

Add restriction to minimumBid being at most 1% of market cap.

contracts/core/liquidators/impl/LinearAuction.sol

@@ -86,8 +86,8 @@ contract LinearAuction is Auction {
 
         // remainingCurrentSets must be greater than minimumBid or no bidding would be allowed
         require(
-            _startingCurrentSetQuantity >= minimumBid,
-            "Auction.initializeAuction: Not enough collateral to rebalance"
+            _startingCurrentSetQuantity.div(minimumBid) >= 100,
+            "Auction.initializeAuction: Minimum bid must be less than or equal to 1% of collateral."
         );
 
         _linearAuction.auction.minimumBid = minimumBid;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "set-protocol-contracts",
-  "version": "1.3.17-beta",
+  "version": "1.3.18-beta",
   "description": "Smart contracts for {Set} Protocol",
   "main": "dist/artifacts/index.js",
   "typings": "dist/typings/artifacts/index.d.ts",

test/contracts/core/liquidators/impl/linearAuction.spec.ts

@@ -319,6 +319,16 @@ contract('LinearAuction', accounts => {
         await expectRevertError(subject());
       });
     });
+
+    describe('when there is insufficient collateral to rebalance', async () => {
+      beforeEach(async () => {
+        subjectStartingCurrentSetQuantity = gWei(199);
+      });
+
+      it('should revert', async () => {
+        await expectRevertError(subject());
+      });
+    });
   });
 
   describe('[CONTEXT] Initialized auction', async () => {