Update to 2.2.0 & other updates

README.md

@@ -1,7 +1,7 @@
 # ATNF pulsar catalog for Celestia
 This is a Python script to generate a catalog of pulsars for [Celestia](https://github.com/CelestiaProject/Celestia),
 using the [ATNF pulsar database](https://www.atnf.csiro.au/research/pulsar/psrcat/). It's based on earlier work by
-[Cham](https://celestia.space/forum/viewtopic.php?f=6&t=11372) and [Selden](https://www.classe.cornell.edu/~seb/celestia/catalogs.html#3.5.14).
+[Cham](https://celestiaproject.space/forum/viewtopic.php?f=6&t=11372) and [Selden](https://www.classe.cornell.edu/~seb/celestia/catalogs.html#3.5.14).
 
 The data file necessary to generate the catalog is included in this repository as *atnf_pulsars.csv*, but if you want to
 download it yourself (for example, if the database is updated), here are instructions to do so: