Bump nunjucks from 3.1.2 to 3.1.3

[dependabot-preview]

Bumps nunjucks from 3.1.2 to 3.1.3.

Release notes

Sourced from nunjucks's releases.

v3.1.3

• Add forceescape filter. Fixes #782

• Fix regression that prevented template errors from reporting line and column number. Fixes #1087 and #1095.

• Fix "Invalid type: Is" error for {% if value is defined %}. Fixes #1110

• Formally drop support for node v4 (the upgrade to babel 7 in v3.1.0 made the build process incompatible with node < 6.9.0).

Changelog

Sourced from nunjucks's changelog.

3.1.3 (May 19 2018)

• Add forceescape filter. Fixes #782

• Fix regression that prevented template errors from reporting line and column number.
  Fixes #1087 and
  #1095.

• Fix "Invalid type: Is" error for {% if value is defined %}. Fixes
  #1110

• Formally drop support for node v4 (the upgrade to babel 7 in 3.1.0 made the
  build process incompatible with node < 6.9.0).

Commits

• 9a0ce36 3.13 release - fix typo in CHANGELOG
• c2de0e4 Release 3.1.3
• 4d8a4cc Update chokidar optionalDependency. Fixes #1103
• d140280 Update CONTRIBUTING.md to reflect supported node releases [ci skip]
• af6427d Update CHANGELOG
• 1b76fb8 Update package.json engines to reflect supported node versions
• 8afacce Add unit tests for {% if x is [not] defined %}. refs #1110
• 248cf56 Fix "Invalid type: Is" error when using {% if x is defined %}
• 2eaea16 Drop node v4 support, add node v9
• 8041120 Include file/lineno in TemplateError message. fixes #1087, #1095
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #58.