fix issue #2837

[sharmaB01]

fixed this issue : #2837 Why does @turf/boolean-valid require MultiLineStrings to have at least two component LineStrings? #2837

because multiline will be like { "type": "MultiLineString", "coordinates": [ [ [100.0, 0.0], [101.0, 1.0], [102.0, 2.0] ] ] }