bpo-32838: Fix Python versions in the table of magic numbers. (#5658)

diff --git a/Lib/importlib/_bootstrap_external.py b/Lib/importlib/_bootstrap_external.py
index f9a708c..e295174 100644
--- a/Lib/importlib/_bootstrap_external.py
+++ b/Lib/importlib/_bootstrap_external.py
@@ -197,52 +197,55 @@
 #                    3101 (merge from 2.6a0, see 62151)
 #                    3103 (__file__ points to source file)
 #     Python 3.0a4: 3111 (WITH_CLEANUP optimization).
-#     Python 3.0a5: 3131 (lexical exception stacking, including POP_EXCEPT)
-#     Python 3.1a0: 3141 (optimize list, set and dict comprehensions:
-#             change LIST_APPEND and SET_ADD, add MAP_ADD)
-#     Python 3.1a0: 3151 (optimize conditional branches:
-#             introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE)
-#     Python 3.2a0: 3160 (add SETUP_WITH)
+#     Python 3.0b1: 3131 (lexical exception stacking, including POP_EXCEPT
+                          #3021)
+#     Python 3.1a1: 3141 (optimize list, set and dict comprehensions:
+#                         change LIST_APPEND and SET_ADD, add MAP_ADD #2183)
+#     Python 3.1a1: 3151 (optimize conditional branches:
+#                         introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE
+                          #4715)
+#     Python 3.2a1: 3160 (add SETUP_WITH #6101)
 #                   tag: cpython-32
-#     Python 3.2a1: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR)
+#     Python 3.2a2: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR #9225)
 #                   tag: cpython-32
-#     Python 3.2a2  3180 (add DELETE_DEREF)
-#     Python 3.3a0  3190 __class__ super closure changed
-#     Python 3.3a0  3200 (__qualname__ added)
-#                      3210 (added size modulo 2**32 to the pyc header)
-#     Python 3.3a1  3220 (changed PEP 380 implementation)
-#     Python 3.3a4  3230 (revert changes to implicit __class__ closure)
+#     Python 3.2a3  3180 (add DELETE_DEREF #4617)
+#     Python 3.3a1  3190 (__class__ super closure changed)
+#     Python 3.3a1  3200 (PEP 3155 __qualname__ added #13448)
+#     Python 3.3a1  3210 (added size modulo 2**32 to the pyc header #13645)
+#     Python 3.3a2  3220 (changed PEP 380 implementation #14230)
+#     Python 3.3a4  3230 (revert changes to implicit __class__ closure #14857)
 #     Python 3.4a1  3250 (evaluate positional default arguments before
-#                        keyword-only defaults)
+#                        keyword-only defaults #16967)
 #     Python 3.4a1  3260 (add LOAD_CLASSDEREF; allow locals of class to override
-#                        free vars)
-#     Python 3.4a1  3270 (various tweaks to the __class__ closure)
+#                        free vars #17853)
+#     Python 3.4a1  3270 (various tweaks to the __class__ closure #12370)
 #     Python 3.4a1  3280 (remove implicit class argument)
-#     Python 3.4a4  3290 (changes to __qualname__ computation)
-#     Python 3.4a4  3300 (more changes to __qualname__ computation)
-#     Python 3.4rc2 3310 (alter __qualname__ computation)
-#     Python 3.5a0  3320 (matrix multiplication operator)
-#     Python 3.5b1  3330 (PEP 448: Additional Unpacking Generalizations)
+#     Python 3.4a4  3290 (changes to __qualname__ computation #19301)
+#     Python 3.4a4  3300 (more changes to __qualname__ computation #19301)
+#     Python 3.4rc2 3310 (alter __qualname__ computation #20625)
+#     Python 3.5a1  3320 (PEP 465: Matrix multiplication operator #21176)
+#     Python 3.5b1  3330 (PEP 448: Additional Unpacking Generalizations #2292)
 #     Python 3.5b2  3340 (fix dictionary display evaluation order #11205)
-#     Python 3.5b2  3350 (add GET_YIELD_FROM_ITER opcode #24400)
+#     Python 3.5b3  3350 (add GET_YIELD_FROM_ITER opcode #24400)
 #     Python 3.5.2  3351 (fix BUILD_MAP_UNPACK_WITH_CALL opcode #27286)
-#     Python 3.6a0  3360 (add FORMAT_VALUE opcode #25483
-#     Python 3.6a0  3361 (lineno delta of code.co_lnotab becomes signed)
-#     Python 3.6a1  3370 (16 bit wordcode)
-#     Python 3.6a1  3371 (add BUILD_CONST_KEY_MAP opcode #27140)
-#     Python 3.6a1  3372 (MAKE_FUNCTION simplification, remove MAKE_CLOSURE
+#     Python 3.6a0  3360 (add FORMAT_VALUE opcode #25483)
+#     Python 3.6a1  3361 (lineno delta of code.co_lnotab becomes signed #26107)
+#     Python 3.6a2  3370 (16 bit wordcode #26647)
+#     Python 3.6a2  3371 (add BUILD_CONST_KEY_MAP opcode #27140)
+#     Python 3.6a2  3372 (MAKE_FUNCTION simplification, remove MAKE_CLOSURE
 #                         #27095)
 #     Python 3.6b1  3373 (add BUILD_STRING opcode #27078)
 #     Python 3.6b1  3375 (add SETUP_ANNOTATIONS and STORE_ANNOTATION opcodes
 #                         #27985)
-#     Python 3.6b1  3376 (simplify CALL_FUNCTIONs & BUILD_MAP_UNPACK_WITH_CALL)
+#     Python 3.6b1  3376 (simplify CALL_FUNCTIONs & BUILD_MAP_UNPACK_WITH_CALL
+                          #27213)
 #     Python 3.6b1  3377 (set __class__ cell from type.__new__ #23722)
 #     Python 3.6b2  3378 (add BUILD_TUPLE_UNPACK_WITH_CALL #28257)
 #     Python 3.6rc1 3379 (more thorough __class__ validation #23722)
-#     Python 3.7a0  3390 (add LOAD_METHOD and CALL_METHOD opcodes)
-#     Python 3.7a0  3391 (update GET_AITER #31709)
-#     Python 3.7a0  3392 (PEP 552: Deterministic pycs)
-#     Python 3.7a0  3393 (remove  STORE_ANNOTATION opcode)
+#     Python 3.7a1  3390 (add LOAD_METHOD and CALL_METHOD opcodes #26110)
+#     Python 3.7a2  3391 (update GET_AITER #31709)
+#     Python 3.7a4  3392 (PEP 552: Deterministic pycs #31650)
+#     Python 3.7b1  3393 (remove STORE_ANNOTATION opcode #32550)
 #
 # MAGIC must change whenever the bytecode emitted by the compiler may no
 # longer be understood by older implementations of the eval loop (usually