Update the diff module to v5.2.0 for performance improvements

[v-hal]

Update diff from v3.5.0 to v5.2.0. The update includes significant performance improvements (jsdiff/#448 & jsdiff/#411) which makes it possible to diff larger CloudFormation templates.

For a full list of changes, see the changelog: https://github.com/kpdecker/jsdiff/blob/master/release-notes.md.

Review of breaking changes between version 3.5.0 and 5.2.0

v5.0.0

• Breaking: UMD export renamed from JsDiff to Diff.

We are not affected, since cfn-config doesn't use UMD imports.

• Breaking: Newlines separated into separate tokens for word diff.

Changes in kpdecker/jsdiff#217 affect the diff return value of the diffWords function. We don't use diffWordsin cfn.config.

• Breaking: Unified diffs now match "quirks"

cfn-config doesn't use the unified diff output. The changes in kpdecker/jsdiff#297 affect how unified diff chunks are formatted.

v4.0.0 - January 5th, 2019

• Missing "No newline at end of file" when comparing two texts that do not end in newlines kpdecker/jsdiff#94 - Missing "No newline at end of file" when comparing two texts that do not end in newlines (@federicotdn)

Changes in kpdecker/jsdiff#94 affect only patches in unified diff format, which are not used in cfn-config.

• applyPatch affecting wrong line number with with new lines kpdecker/jsdiff#159 - applyPatch affecting wrong line number with with new lines

Changes affect only patches in unified diff format, which are not used in cfn-config.

• Drop ie9 from karma targets - 79c31bd

cfn-config is not affected by browser targets.

• Make ()[]"' as word boundaries between each other - f27b899

Changes in kpdecker/jsdiff@f27b899 affect word diffs, which are not used in cfn-config.

• Compatibility notes: Bower and Component packages no longer supported

cfn-config doesn't use bower.