Lock down version of aws-xray-sdk
Lock down version of aws-xray-sdk

See https://travis-ci.org/spulec/moto/jobs/350056229

whummer/moto,okomestudio/moto,whummer/moto,Brett55/moto,whummer/moto,rocky4570/moto,spulec/moto,okomestudio/moto,whummer/moto,rocky4570/moto,whummer/moto,Brett55/moto,okomestudio/moto,william-richard/moto,Brett55/moto,spulec/moto,rocky4570/moto,rocky4570/moto,william-richard/moto,botify-labs/moto,spulec/moto,Brett55/moto,botify-labs/moto,botify-labs/moto,rocky4570/moto,botify-labs/moto,william-richard/moto,Brett55/moto,william-richard/moto,rocky4570/moto,okomestudio/moto,botify-labs/moto,spulec/moto,Brett55/moto,okomestudio/moto,william-richard/moto,whummer/moto,spulec/moto,william-richard/moto,spulec/moto,okomestudio/moto,botify-labs/moto