Update pact-node dependency to 8.1.1

[anthonyvongpp]

Software versions

• OS: CentOS
• Consumer Pact library: Pact JS v8.0.5
• Node Version: v10.12.0

Expected behaviour

Successfully downloads and extracts pact-ruby-standalone.

Actual behaviour

We were experiencing issues found in
pact-foundation/pact-js-core#149

Running into issues with the checksum of pact ruby standalone 1.63 when doing an npm install. There was a fix in pact-node v8.1.1 but pact-js has a dependency on pact-node v6.21.4
https://github.com/pact-foundation/pact-js/blob/master/package.json#L79

Relevant log files

> @pact-foundation/pact-node@6.21.5 postinstall /[WORKSPACE]/node_modules/@pact-foundation/pact-node

> node postinstall.js



Installing Pact Standalone Binary for linux.

Downloading Pact Standalone Binary v1.63.0 for platform linux from https://github.com/pact-foundation/pact-ruby-standalone/releases/download/v1.63.0/pact-1.63.0-linux-x86_64.tar.gz

Please note: we are tracking this download anonymously to gather important usage statistics. To disable tracking, set 'pact_do_not_track: true' in your package.json 'config' section.

Finished downloading binary to /[WORKSPACE]/node_modules/@pact-foundation/pact-node/standalone/pact-1.63.0-linux-x86_64.tar.gz

Extracting binary from /[WORKSPACE]/node_modules/@pact-foundation/pact-node/standalone/pact-1.63.0-linux-x86_64.tar.gz.

(node:7214) UnhandledPromiseRejectionWarning: Error: Error while installing binary: Postinstalled Failed Unexpectedly: Error: Error while installing binary: Extraction failed for /[WORKSPACE]/node_modules/@pact-foundation/pact-node/standalone/pact-1.63.0-linux-x86_64.tar.gz: Error: Error while installing binary: Checksum rejected for file 'pact-1.63.0-linux-x86_64.tar.gz' with checksum pact-1.63.0-linux-x86_64.tar.gz.checksum

    at throwError (/[WORKSPACE]/node_modules/@pact-foundation/pact-node/standalone/install.js:232:11)

    at /[WORKSPACE]/node_modules/@pact-foundation/pact-node/standalone/install.js:265:38

    at process._tickCallback (internal/process/next_tick.js:68:7)

(node:7214) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)

(node:7214) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.