Bump dockerfile-parse from 0.0.13 to 0.0.15

[dependabot-preview]

Bumps dockerfile-parse from 0.0.13 to 0.0.15.

Release notes

Sourced from dockerfile-parse's releases.

0.0.15

• implementation of comment instructions in DockerfileParser.structure
• enable building py3 package for rhel8
• improved error reporting when incorrect LABEL syntax is used

0.0.14

• python 2.6 support has been dropped
• The add_lines_at() method now correctly handles after=True when the anchor is a multi-line instruction from the structure.

Commits

• 4c5303f spec: update hash for 0.0.15
• 256e7fc 0.0.15 release
• 356851a Merge pull request #82 from chmeliik/label-env-syntax
• eb97ca2 Give a better error message for ENV/LABEL syntax error
• cd66972 Merge pull request #80 from rcerven/fed30
• f9e0529 enable fedora 30 testing
• a4a2525 Run Bandit static analyzer on CI jobs
• 41ebf22 Merge pull request #75 from rcerven/long_desc
• d49c4b4 Merge pull request #79 from rcerven/migrate_github
• 3dabfc5 change organization references from DBuildService to containerbuildsystem
• Additional commits viewable in compare view

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