Add renaming advice based on Linux kernel spelling (#1554)

Recommend the renaming of whitelist/blacklist to allowlist/blocklist as
per kernel patch:
https://lore.kernel.org/lkml/20200609122549.26304-1-sjpark@amazon.com/

“[T]he new suggestions are incontrovertible, doesn't make people hurt,
 and more self-explanatory.”

codespell_lib/data/dictionary.txt

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index ee8c2fa..61a6eb5 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -3556,7 +3556,7 @@
 bject->object
 bjects->objects
 blackslashes->backslashes
-blaclist->blacklist
+blaclist->blocklist
 blaim->blame
 blaimed->blamed
 blak->black, blank,
@@ -28039,10 +28039,10 @@
 whihc->which
 whihch->which
 whilest->whilst
-whiltelist->whitelist
-whiltelisted->whitelisted
-whiltelisting->whitelisting
-whiltelists->whitelists
+whiltelist->allowlist
+whiltelisted->allowlisted
+whiltelisting->allowlisting
+whiltelists->allowlists
 whilw->while
 whioch->which
 whiped->wiped

codespell_lib/data/dictionary_rare.txt

diff --git a/codespell_lib/data/dictionary_rare.txt b/codespell_lib/data/dictionary_rare.txt
index cd425c0..8a134b9 100644
--- a/codespell_lib/data/dictionary_rare.txt
+++ b/codespell_lib/data/dictionary_rare.txt
@@ -6,6 +6,7 @@
 automatizes->automates
 backword->backward
 backwords->backwards
+blacklist->blocklist
 bloc->block
 blocs->blocks
 bodgy->body
@@ -134,6 +135,7 @@
 whats->what's
 whet->when, what, wet,
 whiling->while
+whitelist->allowlist
 wight->weight, white, right, write,
 wights->weights, whites, rights, writes,
 wit->with