Merge Import mas and μas from UnitfulAngle (#35) into master

Author: FerreolS

Project.toml

@@ -10,7 +10,7 @@ UnitfulAngles = "6fb2a4bd-7999-5318-a3b2-8ad61056cd98"
 [compat]
 Test = "1"
 Unitful = "1.2"
-UnitfulAngles = "0.5, 0.6, 0.7"
+UnitfulAngles = "0.7"
 julia = "1.6.0"
 
 [extras]

src/UnitfulAstro.jl

@@ -43,7 +43,7 @@ should_we_use_SI_prefixes(arg::Symbol) = false, arg
 # CGS units have been moved to default Unitful.jl now
 @import_from_unitful dyn erg
 
-import UnitfulAngles: arcminute, arcsecond
+import UnitfulAngles: arcminute, arcsecond, mas, μas
 
 #    symbol      abbrev     name                      equality                  tf