Increment version 0.16.0

[albi3ro]

• Incremented the version number to 0.16.0
• Incremented the pennylane_requires attribute
• Deprectaed Python 3.6: removed Python 3.6 CI check and Python 3.6> mentions

[codecov]

Codecov Report

Merging #140 (0dce83d) into master (c021664) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   99.30%   99.30%           
=======================================
  Files           7        7           
  Lines         287      287           
=======================================
  Hits          285      285           
  Misses          2        2           

Impacted Files	Coverage Δ
pennylane_qiskit/_version.py	100.00% <100.00%> (ø)
pennylane_qiskit/qiskit_device.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c021664...0dce83d. Read the comment docs.

[antalszava]

Hi @albi3ro, thanks! 🙂 I think we'll have to increase the pennylane_requires attribute and pin the pennylane versions in the requirements.txt and setup.py files to v0.16.0 due to the projector addition. With previous PL versions that would be failing, as qml.Projector was added in v0.16.0.

[antalszava]

Checks ran well in the last commit that used the latest version of PennyLane: 814ea3b

As this plugin will depend on v0.16.0 of PennyLane, checks are failing now.