Bug fix for small negative real part of complex number.

[AndrewGibbs]

I noticed that the following:

lambertw(-0.4087512737796557 + 0.038455913083347504im, 0)

caused an error, and that this has already been raised as issue #35.

This was a simple fix, changing line 136 of src/LabertW.jl, pointseven = 7//10 ↦ pointseven = 0.7. I have also added a new test to the testset to confirm that this fixes the issue.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.34%. Comparing base (8666d64) to head (af4d441).

❗ There is a different number of reports uploaded between BASE (8666d64) and HEAD (af4d441). Click for more details.

HEAD has 12 uploads less than BASE

Flag	BASE (8666d64)	HEAD (af4d441)
	18	6

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #36       +/-   ##
===========================================
- Coverage   99.40%   78.34%   -21.07%     
===========================================
  Files           1        1               
  Lines         168      157       -11     
===========================================
- Hits          167      123       -44     
- Misses          1       34       +33     

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