inaccurate node.end offset for FunctionDeclaration

[duaraghav8]

and also for ModifierDeclarations

code = contract Foo {\n\tmodifier bar () returns (string) {\n\t\treturn "Hello";\n\t}\n\n\n\tfunction baz () {}\n}

a = sp.parse (code).body [0]

code.slice (0,a.body [0].end)

returns

contract Foo {\n\tmodifier bar () returns (string) {\n\t\treturn "Hello";\n\t}\n\n\n\t

should've stopped at "}" but also included the whitespace