[Snyk] Security upgrade nodemon from 1.12.1 to 2.0.3

Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
- examples/demand-express/package.json
- examples/demand-express/package-lock.json

Severity	Issue	Breaking Change	Exploit Maturity
	Prototype Pollution SNYK-JS-DOTPROP-543489	Yes	Proof of Concept

Commit messages

Package name: nodemon

The new version differs by 199 commits.

ee92ee4 test: split require tests
33ae6da test: fix failing test when required
a4490e2 fix: package.json & package-lock.json to reduce vulnerabilities
9bd07eb docs: changed verbose logging and CLI documentation to reflect support single file watch functionality
c279760 test: make sigint test to actually check child pid (#1656)
cd45d74 test: fix fork test
496c335 chore: undo change to spawn code
47dfb8b fix: pipe stderr correctly
ed91703 fix: ubuntu loop waiting for sub processes
9a67f36 feat: update chokidar to v3
6781b40 docs: add license file
0e6ba3c fix: wait for all subprocesses to terminate (fixes issue #1476)
b58cf7d chore: Merge branch 'master'
95a4c09 docs: add to faq
3a2eaf7 choe: merge master
3d90879 chore: add logo to site
7d6c1a8 fix: Replace `jade` references by `pug`
74c8749 chore: test funding.yml change
c1a8b75 chore: update funding
d5b9891 test: ensure ignore relative paths
eead311 fix: to avoid confusion like in #1528, always report used extension
12b66cd fix: langauge around "watching" (#1591)
2e6e2c4 docs: README Grammar (#1601)
5124ae9 Merge branch 'master' of github.com:remy/nodemon

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