message: fix: upgrade to ffi 0.3.15
diff: @@ -5,7 +5,7 @@ import bindings = require('bindings');
  const ffiLib: Ffi = bindings('pact.node');
  -export const PACT_FFI_VERSION = '0.3.14';
  +export const PACT_FFI_VERSION = '0.3.15';
  let ffi: typeof ffiLib;
  let ffiLogLevel: LogLevel;
  