fix bug #1010215

Georges Khaznadarrequested to merge
georgesk/einsteinpy:master into master

there was an error in tests/test_symbolic/test_tensor.py: sympy.lambdify's third argument may not be a symbol np, it must be the string "numpy"

If using the symbol np rather than the string "numpy" was a current practice around (not only in the test suite), then a deprecation warning should be published too.

This PR is closed : another bug was triggered by the change

Edited by Georges Khaznadar

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