Add more of the public functions to the TypeScript definition

Author: axic

index.d.ts

@@ -1,4 +1,15 @@
 declare module "solc" {
+  export function version(): string;
+  export function semver(): string;
+  export function license(): string;
+
+  export let features: {
+    legacySingleInput: boolean,
+    multipleInputs: boolean,
+    importCallback: boolean,
+    nativeStandardJSON: boolean,
+  };
+
   export type ReadCallbackResult = { contents: string } | { error: string };
   export type ReadCallback = (path: string) => ReadCallbackResult;
   export function compile(input: string, readCallback?: ReadCallback): string;