Mention node version when building from source

[nwneisen]

I have PopOS 18.04 installed which is based off of Ubuntu 18.04. I had the default version of node (8.10.0) installed using apt and this was too old to build InfluxDB. It would be good to mention the needed version of node (10.13.0) in the "Building From Source" section of the project's README.md.

Steps to reproduce: List the minimal actions needed to reproduce the behavior.

1. Change node version to be below 10.13.0
2. Run make in the root of the InfluxDB project

Expected behavior: Project successfully builds. I don't expect a successful build with an incorrect version but it was a dependency I didn't check before hand.

Actual behavior: There is an error about an incorrect node version

error @typescript-eslint/eslint-plugin@2.6.0: The engine "node" is incompatible with this module. Expected version "^8.10.0 || ^10.13.0 || >=11.10.1". Got "10.5.0"

Followed by errors that look more Go related

chronograf/canned/bin.go:20:11: undefined: AssetNames
chronograf/canned/bin.go:23:18: undefined: Asset
# github.com/influxdata/influxdb/chronograf/dist
chronograf/dist/dist.go:39:13: undefined: AssetInfo
chronograf/dist/dist.go:59:18: undefined: Asset
chronograf/dist/dist.go:74:11: undefined: Asset
chronograf/dist/dist.go:83:14: undefined: AssetDir
chronograf/dist/dist.go:84:14: undefined: AssetInfo
Makefile:68: recipe for target 'bin/linux/influx' failed
make: *** [bin/linux/influx] Error 2

Environment info: PopOS 18.04

• System info: Run uname -srm and copy the output here Linux 4.15.0-64-generic x86_64

• InfluxDB version: Run influxd version and copy the output here master branch

• Other relevant environment details: Container runtime, disk info, etc NA

Config: NA

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