Merge pull request #23 from gkjohnson/patch-1

update README

Author: camargo

README.md

@@ -196,6 +196,7 @@ bodvrd( body, item, maxn )
 convrt( x, in_var, out )
 deltet( epoch, eptype )
 erract( op, action )
+errprt( op, list )
 et2lst( et, body, lon, type )
 et2utc( et, format, prec )
 etcal( et )
@@ -220,6 +221,7 @@ scs2e( sc, sclkch )
 sct2e( sc, sclkdp )
 sctiks( sc, clkstr )
 spd()
+spkpos( targ, et, ref, abcorr, obs )
 str2et( str )
 timdef( action, item, value )
 timout( et, pictur )