Register bedGraph format (#149)

Author: CiaranOMara

src/registry.jl

@@ -29,6 +29,8 @@ add_format(format"SAS", UInt8[0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0xcf, 0xbd, 0x92, 0x08, 0x00, 0x09, 0xc7, 0x31, 0x8c, 0x18, 0x1f,
     0x10, 0x11], [".sas7bdat"], [:StatFiles, LOAD])
 
+add_format(format"bedGraph", UInt8[0x74, 0x79, 0x70, 0x65, 0x3D, 0x62, 0x65, 0x64, 0x47, 0x72, 0x61, 0x70, 0x68], [".bedgraph"], [:BedgraphFiles])
+
 # Image formats
 add_format(format"PBMBinary", b"P4", ".pbm", [:ImageMagick])
 add_format(format"PGMBinary", b"P5", ".pgm", [:Netpbm])