Update package version to 4.6.4

pkg.info

@@ -1,9 +1,11 @@
 name: cfitsio
 description: C and Fortran subroutines for reading and writing data files in FITS (Flexible Image Transport System) data format
-version: 4.6.3
+version: 4.6.4
 revision: 1
 url: https://heasarc.gsfc.nasa.gov/fitsio/
 license: custom
+maintainers:
+  - [email protected]
 architecture: any
 type: source
 depends:
@@ -16,4 +18,4 @@ downloads:
   - url: https://heasarc.gsfc.nasa.gov/FTP/software/fitsio/c/cfitsio-${BPM_PKG_VERSION}.tar.gz
     extract_to: ${BPM_SOURCE}
     extract_strip_components: 1
-    checksum: fad44fff274fdda5ffcc0c0fff3bc3c596362722b9292fc8944db91187813600
+    checksum: 227b637b91c9820ea96f39a65eb087f053de567d82f4338e2884f123f8183c55