.gitattributes: enable solidity highlighting on github (#16425)

ldct · fjl · commit 6cdfb9a3ebd0 · 2018-04-03T15:21:24.000+02:00
diff --git a/.gitattributes b/.gitattributes
@@ -1,2 +1,3 @@
 # Auto detect text files and perform LF normalization
 * text=auto
+*.sol linguist-language=Solidity

Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,3 @@`
`1`	`1`	`# Auto detect text files and perform LF normalization`
`2`	`2`	`* text=auto`
	`3`	`+*.sol linguist-language=Solidity`