Fix SPDX Identifier and bump package version (#80)

Fix license identifier and bump package

Author: ncitron

contracts/adapters/AaveLeverageStrategyExtension.sol

@@ -12,6 +12,8 @@
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
+
+    SPDX-License-Identifier: Apache License, Version 2.0
 */
 
 pragma solidity 0.6.10;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@setprotocol/index-coop-contracts",
-  "version": "0.0.27",
+  "version": "0.0.28",
   "description": "",
   "main": "dist",
   "types": "dist/types",