Expose uv_version() for libuv API compatibility

Author: fantix

tests/test_pointers.py

@@ -16,3 +16,7 @@ def test_get_uv_loop_t_ptr(self):
 
         self.assertTrue(cython_helper.capsule_equals(cap1, cap2))
         self.assertFalse(cython_helper.capsule_equals(cap1, cap3))
+
+    def test_get_uv_version(self):
+        from uvloop.loop import get_uv_version
+        self.assertGreater(get_uv_version(), 0)

uvloop/includes/uv.pxd

@@ -501,3 +501,5 @@ cdef extern from "uv.h" nogil:
                  const uv_process_options_t* options)
 
     int uv_process_kill(uv_process_t* handle, int signum)
+
+    unsigned int uv_version()

uvloop/loop.pyx

@@ -3231,6 +3231,10 @@ cdef class Loop:
         return PyCapsule_New(<void *>self.uvloop, NULL, NULL)
 
 
+def get_uv_version():
+    return uv.uv_version()
+
+
 cdef void __loop_alloc_buffer(uv.uv_handle_t* uvhandle,
                               size_t suggested_size,
                               uv.uv_buf_t* buf) with gil: