Merge pull request #272 from pllim/specutils-2.0-main

TST: specutils 2.0 now in main

Author: hpparvi

tox.ini

@@ -38,7 +38,7 @@ deps =
     devdeps: scipy>=0.0.dev0
     devdeps: pyerfa>=0.0.dev0
     devdeps: astropy>=0.0.dev0
-    devdeps: git+https://github.com/astropy/specutils.git@v2.0-dev#egg=specutils
+    devdeps: git+https://github.com/astropy/specutils.git#egg=specutils
     devdeps: photutils>=0.0.dev0
     devdeps: git+https://github.com/spacetelescope/synphot_refactor.git#egg=synphot