Add notes about card entropy

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                     <p>
                         <a href="https://bitcointalk.org/index.php?topic=311000.msg3345309#msg3345309" target="_blank">You are not a good source of entropy.</a>
                     </p>
+                    <p>
+                        <span>Card entropy has been implemented assuming cards are replaced, not drawn one after another.</span>
+                        <span>A full deck with replacement generates 232 bits of entropy (21 words). A full deck without replacement generates 225 bits of entropy (21 words).</span>
+                        <span>Card entropy changed significantly from v0.4.3 to v0.5.0. The old version can be accessed at
+                            <a href="https://github.com/iancoleman/bip39/releases/tag/0.4.3">
+                                https://github.com/iancoleman/bip39/releases/tag/0.4.3
+                            </a>
+                            or
+                            <a href="https://web.archive.org/web/20201018232020/https://iancoleman.io/bip39/">
+                                https://web.archive.org/web/20201018232020/https://iancoleman.io/bip39/
+                            </a>
+                        </span>
+                    </p>
                     <h3>License</h3>
                     <p>
                     <span>Please refer to <a href="https://github.com/iancoleman/bip39/blob/master/LICENSE" target="_blank">the software license</a> for more detail.