Add new contributors

Lacey Powers for databases/pg_partman and security/chkrootkit [1]
Neal Nelson for devel/nimble and lang/nim [2]
Sebastian Schwarz for of mail/py-afew [3]

PR:		222926 [1]
PR:		222427 [2]
PR:		222629 [3]

en_US.ISO8859-1/articles/contributors/contrib.additional.xml

@@ -5979,6 +5979,11 @@
       <email>ljo@ljo-slip.DIALIN.CWRU.Edu</email></para>
   </listitem>
 
+  <listitem>
+    <para>Lacey Powers
+      <email>lacey.leanne@gmail.com</email></para>
+  </listitem>
+
   <listitem>
     <para>Lapo Luchini
       <email>lapo@lapo.it</email></para>
@@ -7564,6 +7569,11 @@
       <email>kneel@ishiboo.com</email></para>
   </listitem>
 
+  <listitem>
+    <para>Neal Nelson
+      <email>ports@nicandneal.net</email></para>
+  </listitem>
+
   <listitem>
     <para>Necati Ersen Siseci
       <email>siseci@enderunix.org</email></para>
@@ -9527,6 +9537,11 @@
       <email>dereckson@gmail.com</email></para>
   </listitem>
 
+  <listitem>
+    <para>Sebastian Schwarz
+      <email>seschwar@gmail.com</email></para>
+  </listitem>
+
   <listitem>
     <para>Sebastian Strollo
       <email>seb@erix.ericsson.se</email></para>