mermaid: Possibly incorrect dagre-d3 version in package.json

Hi, I’m experiencing an issue while trying to install version ~8.4 via npm.

Let me expose it in an empty environment: sudo docker run --rm -it node:12.3-alpine sh -c "npm i -g --loglevel verbose mermaid@~8.4"

This unfortunately results in:

npm info it worked if it ends with ok
npm verb cli [
npm verb cli   '/usr/local/bin/node',
npm verb cli   '/usr/local/bin/npm',
npm verb cli   'i',
npm verb cli   '-g',
npm verb cli   '--loglevel',
npm verb cli   'verbose',
npm verb cli   'mermaid@~8.4'
npm verb cli ]
npm info using npm@6.9.0
npm info using node@v12.3.1
npm verb npm-session 6d5644b94274e0d7
npm http fetch GET 200 https://registry.npmjs.org/mermaid 160ms
npm timing stage:loadCurrentTree Completed in 209ms
npm timing stage:loadIdealTree:cloneCurrentTree Completed in 1ms
npm timing stage:loadIdealTree:loadShrinkwrap Completed in 2ms
npm http fetch GET 200 https://registry.npmjs.org/crypto-random-string 181ms
npm http fetch GET 200 https://registry.npmjs.org/d3 182ms
npm http fetch GET 200 https://registry.npmjs.org/graphlib 178ms
npm http fetch GET 200 https://registry.npmjs.org/he 179ms
npm http fetch GET 200 https://registry.npmjs.org/minify 183ms
npm http fetch GET 200 https://registry.npmjs.org/lodash 193ms
npm http fetch GET 200 https://registry.npmjs.org/moment-mini 194ms
npm http fetch GET 200 https://registry.npmjs.org/prettier 120ms
npm http fetch GET 200 https://registry.npmjs.org/dagre 213ms
npm http fetch GET 200 https://registry.npmjs.org/scope-css 138ms
npm http fetch GET 200 https://registry.npmjs.org/@braintree%2fsanitize-url 1167ms
npm timing stage:rollbackFailedOptional Completed in 1ms
npm timing stage:runTopLevelLifecycles Completed in 1408ms
npm verb stack Error: spawn git ENOENT
npm verb stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:264:19)
npm verb stack     at onErrorNT (internal/child_process.js:456:16)
npm verb stack     at processTicksAndRejections (internal/process/task_queues.js:84:9)
npm verb cwd /
npm verb Linux 4.15.0-66-generic
npm verb argv "/usr/local/bin/node" "/usr/local/bin/npm" "i" "-g" "--loglevel" "verbose" "mermaid@~8.4"
npm verb node v12.3.1
npm verb npm  v6.9.0
npm ERR! path git
npm ERR! code ENOENT
npm ERR! errno ENOENT
npm ERR! syscall spawn git
npm ERR! enoent Error while executing:
npm ERR! enoent undefined ls-remote -h -t ssh://git@github.com/dagrejs/dagre-d3.git
npm ERR! enoent 
npm ERR! enoent 
npm ERR! enoent spawn git ENOENT
npm ERR! enoent This is related to npm not being able to find a file.
npm ERR! enoent 
npm verb exit [ 1, true ]
npm timing npm Completed in 1843ms

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2019-11-12T16_01_29_757Z-debug.log

This issue might be related with: ca5e60b38b98448695d1a00ce1bdd1feeefa046d, since the version specified here is not numerical.