fix READEME

[BlakeKaufman]

The get transaction variable should be changed from

const address = await wollet.getTransactions();
console.log(address);

to

const transactions = await wollet.getTransactions();
console.log(transactions);

---

The txid string returned from a sent transaction should be changed from

 console.log("BROADCASTED TX!\nTXID: {:?}", tx.txId.toString());

to

 console.log("BROADCASTED TX!\nTXID: {:?}", (await tx.txId()).toString());

---

Also, we might want to add documentation saying you need to add in the android > build.gradle as well as the minSdkVersion being 24

allprojects {
    repositories {
        // * Your other repositories here *
        maven {
            name = "GitHubPackages"
            url = uri("https://maven.pkg.github.com/blockstream/lwk")
            // * Github personal access token *
            credentials { 
                username = System.getenv("GITHUB_USER")
                password = System.getenv("GITHUB_TOKEN")
            }
        }
    }
}

[lvaccaro]

sorry to be late, thanks to report these issues.
Open MR9 and feel free to add feedbacks and comments