Dependency upgrades/TS4 support

#22

npmignore update

Ignore test files, and various configs from published package

Change comments from @type to @tsassert

Change @type to @tsassert to prevent potential clashes with other tools, or accidental confusion with docs comments, etc.

#17

Adjust diff color highlighting

Highlight diff background so that whitespace is more obvious.

Improved logs (visual diff)

• Improve log color consistency
• Add spacing between logs
• Add diff of expected vs received types

Next line type comments

Allow placing type comments above the line that you wish to assert.

#13

Assert return types

Allow asserting return types of call and new expressions.

#12

Tsconfig exclude fix (and a few other adjustments to buggy globbing)

• Always use relative paths
• Exclude node_modules from all checks
• Use glob only if truthy
• Always use globs if provided

Respect tsconfig exclude option (and improved logs)

THIS RELEASE DOES NOT WORK AS INTENDED

#9

Loosen TypeScript dependency

Allow any 3.x.x version
#8