Bump up circom_tester version to 0.0.19

[motxx]

This PR fixes npm run test.
The following errors show in current version.

     LinkError: WebAssembly.instantiate(): Import #1 module="runtime" function="printErrorMessage" error: function import requires a callable
      at builder (node_modules/circom_tester/wasm/witness_calculator.js:19:40)
      at async wasm_tester (node_modules/circom_tester/wasm/tester.js:60:16)
      at async Context.<anonymous> (test/smtprocessor.js:97:19)

[motxx]

I found duplication with the following PR, so I'll close my PR.
#90