Minor code formatting changes using Black

Replace single by double quotes to keep consistency.

table.py

@@ -2,7 +2,7 @@
 from collections import defaultdict
 from subprocess import check_output
 
-lines = check_output(["go", "run", "./cmd/chroma/main.go", "--list"]).decode('utf-8').splitlines()
+lines = check_output(["go", "run", "./cmd/chroma/main.go", "--list"]).decode("utf-8").splitlines()
 lines = [line.strip() for line in lines if line.startswith("  ") and not line.startswith("   ")]
 lines = sorted(lines, key=lambda l: l.lower())
 
@@ -12,4 +12,4 @@
     table[line[0].upper()].append(line)
 
 for key, value in table.items():
-    print("{} | {}".format(key, ', '.join(value)))
+    print("{} | {}".format(key, ", ".join(value)))