Fixed compile-error

Fixed following compile-error which was thrown with nightly build of rust:
````
src\racer\nameres.rs:510:21: 512:79 error: mismatched types: expected `&[racer::Match]`, found `collections::vec::Vec<racer::Match>` (expected &-ptr, found struct collections::vec::Vec)
src\racer\nameres.rs:510         out = out + run_matchers_on_blob(src, point+blobstart, point+blobend,
src\racer\nameres.rs:511                                       searchstr,
src\racer\nameres.rs:512                                       filepath, search_type, local, namespace);
error: aborting due to previous error