qiskit: Benchmark failure on `master`

Trying to build master at commit 729a78b70ec13a83a3898c49c413d1abfcd5eb61 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/292115189

Trying to build master at commit 101ebbef0d7605fe5dfef3d2983cbe7982ab0bf2 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/291789194

Trying to build master at commit ce000ef7a815854cb1c62c824f971d951e35acb6 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/289326956

Trying to build master at commit 5111e24391516bcc7ec8630915dfda9c3d8ae53d failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/288555158

Trying to build master at commit bcf97afdd3272c80db7e7d57747cd4c0ee928f79 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/287074291

Trying to build master at commit 27df87038ea045b686e9c0ecaaddc0f99b62d561 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/287045425

Trying to build master at commit 7e754eab4258762b1dfc04609df43a29c499e5c7 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/284006860

Trying to build master at commit c828ea646d0b3346f3a8439fb79c0af502b1ec0c failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/283152364

Trying to build master at commit fbc3f00ed948d94b399e1044f958f8770a467ba0 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/281030438

Trying to build master at commit 4990730a74ab7ae5fa72e494f143cd815ab1e8ae failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/279924449

Trying to build master at commit 30db66f793a480f4e85da6d6f8caf94dde0ed7b2 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/279390670

Trying to build master at commit 0c21938dd84d146c443e5afc4c6c88bbea6c3062 failed. More info at: https://travis-ci.com/Qiskit/qiskit-terra/jobs/278395530