npm ls web3
        inbox@1.0.0 /home/mdvenkatesh/Desktop/etherium solidity programes/inbox
        +-- truffle-hdwallet-provider@0.0.6
        | `-- web3@0.18.4
        `-- web3@1.0.0-beta.26

accounts = await web3.eth.getAccounts();
           ^^^^^

SyntaxError: await is only valid in async function

npm remove web3@0.18.4
npm WARN truffle-hdwallet-provider@0.0.6 requires a peer of truffle@4.x but none is installed. You must install peer dependencies yourself.
npm WARN inbox@1.0.0 No description
npm WARN inbox@1.0.0 No repository field.