Simplify Etherscan verification (#45)

* update to solidity 0.6.11
* remove experimental pragma

Author: e18r

Makefile

@@ -1,8 +1,8 @@
-all          :; dapp --use solc:0.6.7 build
-#build		 :; SOLC_FLAGS="--libraries src/MathLib.sol:MathLib:0x987dc24Dd903F626E8C55769BFc684871Fa28E24" dapp --use solc:0.6.7 build --extract
-build		 :; dapp --use solc:0.6.7 build --extract
+all          :; dapp --use solc:0.6.11 build
+#build		 :; SOLC_FLAGS="--libraries src/MathLib.sol:MathLib:0x987dc24Dd903F626E8C55769BFc684871Fa28E24" dapp --use solc:0.6.11 build --extract
+build		 :; dapp --use solc:0.6.11 build --extract
 clean        :; dapp clean
 test         :; ./test.sh
 # KOVAN 0x987dc24Dd903F626E8C55769BFc684871Fa28E24
-#deploy       :; SOLC_FLAGS="--optimize --optimize-runs 200 --libraries src/MathLib.sol:MathLib:0x987dc24Dd903F626E8C55769BFc684871Fa28E24" dapp --use solc:0.6.7 create DssExecLib
-deploy       :; dapp --use solc:0.6.7 create DssExecLib
+#deploy       :; SOLC_FLAGS="--optimize --optimize-runs 200 --libraries src/MathLib.sol:MathLib:0x987dc24Dd903F626E8C55769BFc684871Fa28E24" dapp --use solc:0.6.11 create DssExecLib
+deploy       :; dapp --use solc:0.6.11 create DssExecLib

src/CollateralOpts.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.6.7;
+pragma solidity ^0.6.11;
 
 struct CollateralOpts {
     bytes32 ilk;

src/DssAction.sol

@@ -17,8 +17,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-pragma solidity ^0.6.7;
-pragma experimental ABIEncoderV2;
+pragma solidity ^0.6.11;
 
 import "./CollateralOpts.sol";
 

src/DssExec.sol

@@ -17,7 +17,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-pragma solidity ^0.6.7;
+pragma solidity ^0.6.11;
 
 interface PauseAbstract {
     function delay() external view returns (uint256);

src/DssExecFactory.sol

@@ -16,7 +16,7 @@
 //
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
-pragma solidity ^0.6.7;
+pragma solidity ^0.6.11;
 
 import "./DssExec.sol";
 

src/DssExecLib.sol

@@ -16,7 +16,7 @@
 //
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
-pragma solidity ^0.6.7;
+pragma solidity ^0.6.11;
 
 import "./MathLib.sol";
 

src/MathLib.sol

@@ -16,7 +16,7 @@
 //
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
-pragma solidity ^0.6.7;
+pragma solidity ^0.6.11;
 
 library MathLib {
 

src/test/DssAction.t.sol

@@ -17,7 +17,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-pragma solidity ^0.6.7;
+pragma solidity ^0.6.11;
 
 import "ds-test/test.sol";
 import "ds-token/token.sol";

src/test/DssExec.t.sol

@@ -17,8 +17,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-pragma solidity ^0.6.7;
-pragma experimental ABIEncoderV2;
+pragma solidity ^0.6.11;
 
 import "ds-test/test.sol";
 import "ds-math/math.sol";

src/test/DssExecFactory.t.sol

@@ -17,8 +17,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-pragma solidity ^0.6.7;
-pragma experimental ABIEncoderV2;
+pragma solidity ^0.6.11;
 
 import "ds-test/test.sol";
 import "ds-math/math.sol";

src/test/DssTestAction.sol

@@ -17,8 +17,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-pragma solidity ^0.6.7;
-pragma experimental ABIEncoderV2;
+pragma solidity ^0.6.11;
 
 import "../DssAction.sol";
 

src/test/rates.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.6.7;
+pragma solidity ^0.6.11;
 
 contract Rates {