Resolve eslint peer by cwd

`cwd` is not a valid option, it needs to be `basedir`, which defaults
to `__basedir`.  That’s fine for direct dependencies, but not for
peers like eslint.

src/config/formatters.js

@@ -4,6 +4,6 @@ These will be used as custom formatters.
 
 import resolve from 'resolve';
 
-export var stats = resolve.sync('eslint-stats/byErrorAndWarning.js', { cwd: process.cwd() });
-export var summary = resolve.sync('eslint-summary/summary.js', { cwd: process.cwd() });
-export var detailed = resolve.sync('eslint-formatter-friendly', { cwd: process.cwd() });
+export var stats = resolve.sync('eslint-stats/byErrorAndWarning.js');
+export var summary = resolve.sync('eslint-summary/summary.js');
+export var detailed = resolve.sync('eslint-formatter-friendly');

src/nibbler.js

@@ -2,7 +2,7 @@
 
 import resolve from 'resolve';
 
-const { CLIEngine } = require(resolve.sync('eslint', { cwd: process.cwd() }));
+const { CLIEngine } = require(resolve.sync('eslint', { basedir: process.cwd() }));
 let cli = new CLIEngine({});
 
 function getCounts(messages) {