32-bit error message is sometimes misleading

[fagerbua]

The changes in #46 makes the plugin fail when Flow doesn't run. That is clearly an improvement. But the error message is not always accurate: it complains about 32 bit even when the cause is something else — for example, the glibc version being too low (Flow issue #49), or the FLOW_BIN variable pointing to a binary that doesn't exist.

As a solution I would propose changing the error message to say simply that the plugin was unable to run Flow. If the 32-bit error is very common it might still be mentioned as a possible cause.

If you agree I could try to prepare a PR for this change.

[amilajack]

@fagerbua i agree with this. A PR would be welcome. Mentioning likely issues with why flow might not be running would be a nice improvement. Ex:

Flow could not be run. Common issues include
* running on 32-bit OS
* glibc not found (https://github.com/flowtype/flow-bin/issues/49)

[jdmota]

Sorry about that. Didn't know about those cases.

For the PR, you just need to change the message here:

eslint-plugin-flowtype-errors/src/index.js

Lines 48 to 53 in 2586b6f

	function error32bit() {
	return {
	loc: 1,
	message: "Flow does not support 32 bit OS's at the moment."
	};
	}