_createInjectionPoint(contract, key, value) {
    value.contractName = contract.contractName;

    (contract.injectionPoints[key])
      ? contract.injectionPoints[key].push(value)
      : contract.injectionPoints[key] = [value];
  }
Adds injection point to injection points map
@param  {Object} contract instrumentation target
@param  {String} key      injection point `type`
@param  {Number} value    injection point `id`