Update README.md (#16)

README.md

@@ -15,7 +15,7 @@ Weiroll programs consist of a sequence of delegatecalls to library functions in
 
 The easiest way to do this is by wrapping ethers.js contract instances:
 
-```
+```javascript
 const ethersContract = new ethers.Contract(address, abi);
 const contract = weiroll.Contract.fromEthersContract(ethersContract);
 ```
@@ -25,26 +25,26 @@ You can repeat this for each library contract you wish to use. A weiroll `Contra
 ### Planning programs
 First, instantiate a planner:
 
-```
+```javascript
 const planner = new weiroll.Planner();
 ```
 
 Next, add one or more commands to execute:
 
-```
-const ret = planner.addCommand(contract.func(a, b));
+```javascript
+const ret = planner.add(contract.func(a, b));
 ```
 
 Return values from one invocation can be used in another one:
 
-```
-planner.addCommand(contract.func2(ret));
+```javascript
+planner.add(contract.func2(ret));
 ```
 
-Remember to wrap each call to a contract in `planner.addCommand`. Attempting to pass the result of one contract function directly to another will not work - each one needs to be added to the planner!
+Remember to wrap each call to a contract in `planner.add`. Attempting to pass the result of one contract function directly to another will not work - each one needs to be added to the planner!
 
 Once you are done planning operations, generate the program:
 
-```
+```javascript
 const {commands, state} = planner.plan();
 ```