Pin pyne to 0.7.0

[andrewfullard]

Fixes showstopper installation issue caused by the change from pyne.data.QAWarning to pyne.utils.QAWarning

Description

Edited pyne module to be specifically 0.7.0 in the environment configuration yml file

Motivation and Context

Fixes installation crash caused by updates to pyne that we don't want to port

How Has This Been Tested?

Tested by installing the environment using this branch and then installing TARDIS using python setup.py develop

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have assigned/requested two reviewers for this pull request.

[codecov]

Codecov Report

Merging #1296 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1296   +/-   ##
=======================================
  Coverage   80.54%   80.54%           
=======================================
  Files          41       41           
  Lines        3423     3423           
=======================================
  Hits         2757     2757           
  Misses        666      666           

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[wkerzendorf]

@chvogl signed off on it.