Updated etherpad-lite-client version to last released

[SerekKiri]

Closes #145

[TravisBuddy]

Travis tests have failed

Hey @SerekKiri,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

Node.js: undefined

View build log

if grep bufferstream package-lock.json ; then false; fi

"bufferstream": "~0.5.1",
            "bufferstream": {
              "resolved": "https://registry.npmjs.org/bufferstream/-/bufferstream-0.5.1.tgz",

TravisBuddy Request Identifier: ae66cdd0-0246-11e9-819e-e174a5d00ea5

[TravisBuddy]

Travis tests have failed

Hey @SerekKiri,
Please read the following log in order to understand the failure reason.
It'll be awesome if you fix what's wrong and commit the changes.

Node.js: undefined

View build log

if grep bufferstream package-lock.json ; then false; fi

"bufferstream": "~0.5.1",
            "bufferstream": {
              "resolved": "https://registry.npmjs.org/bufferstream/-/bufferstream-0.5.1.tgz",

TravisBuddy Request Identifier: dbfe9920-0247-11e9-819e-e174a5d00ea5

[li-boxuan]

This issue is not just about 'using released version'. It is an upstream issue. Read #145