Update README.md, replace 'make astyle' with 'make format'

The former has been replaced by the latter since 62cb38b (Use clang-format, llvm style, for formatting. - 2015-07-27) dòng được
bitjammer · Aug 3, 2017 · 350d145 · 350d145
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commit 350d145
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/README.md b/README.md
@@ -110,9 +110,9 @@ To run a test for memory leaks using `valgrind`:
 
     make leakcheck
 
-To reformat source code using `astyle`:
+To reformat source code using `clang-format`:
 
-    make astyle
+    make format
 
 To run a "fuzz test" against ten long randomly generated inputs: