chore: update Makefile and release-items for 5.0 release

Author: vkarpov15

Makefile

@@ -3,7 +3,7 @@ DOCS_ = $(shell find lib/ -name '*.js')
 DOCS = $(DOCS_:.js=.json)
 DOCFILE = docs/source/_docs
 STABLE_BRANCH = master
-LEGACY_BRANCH = 3.8.x
+LEGACY_BRANCH = 4.x
 
 test:
 	@MONGOOSE_DISABLE_STABILITY_WARNING=1 ./node_modules/.bin/mocha $(T) --async-only test/*.test.js

release-items.md

@@ -1,9 +1,9 @@
 ## mongoose release procedure
 
 1.  tests must pass
-2.  update package.json version
-3.  update History.md using `git changelog` or similar. list the related ticket(s) #<TICKET_NUMBER> as well as a link to the github user who fixed it if applicable.
-4.  git commit -m 'release x.x.x'
+2.  update `package.json` and `package-lock.json` version
+3.  update History.md using `git changelog` or similar. Add #<TICKET_NUMBER> as well as a link to the github user who fixed it if applicable.
+4.  git commit -a -m 'release x.x.x'
 5.  git tag x.x.x
 6.  git push origin BRANCH --tags && npm publish
 7.  update mongoosejs.com (see "updating the website" below)
@@ -14,16 +14,16 @@
 
 ## updating the website
 
-For 4.x
+For 5.x
 
 0. Change to the master branch
 1. execute `make docs` (when this process completes you'll be on the gh-pages branch)
-2. `git commit -a -m 'chore: website 4.x.x'`
+2. `git commit -a -m 'chore: website 5.x.x'`
 3. `git push origin gh-pages`
 
-For 3.8.x:
+For 4.x
 
-0. Change to the 3.8.x branch
+0. Change to the 4.x branch
 1. execute `make docs_legacy` (when this process completes you'll be on the gh-pages branch)
-2. `git commit -a -m 'website; regen <x.x.x>'`
+2. `git commit -a -m 'chore: website 4.x.x'`
 3. `git push origin gh-pages`