Set analytic=False as default

[antalszava]

Changing the default value of analytic since by default warnings are raised when using hardware simulators.

[codecov]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   99.09%   99.09%           
=======================================
  Files           7        7           
  Lines         330      330           
=======================================
  Hits          327      327           
  Misses          3        3

Impacted Files	Coverage Δ
pennylane_qiskit/aer.py	100% <ø> (ø)	⬆️
pennylane_qiskit/basic_aer.py	100% <ø> (ø)	⬆️
pennylane_qiskit/qiskit_device.py	98.61% <100%> (ø)	⬆️

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