errata: note corrections in second printing

Change-Id: Ib0177d712027fb6dd62620f3180e6e38423f7d62

errata.html

@@ -19,7 +19,8 @@ pre {
   <h1>Errata</h1>
   <p>
     <b>p.9, ¶2</b>: for "can compared", read "can be compared".
-    (Thanks to Antonio Macías Ojeda, 2015-10-22.)
+    (Thanks to Antonio Macías Ojeda, 2015-10-22.
+    Corrected in the second printing.)
   </p>
 
   <p>
@@ -52,11 +53,14 @@ pre {
 
   <p>
     <b>p.52, ¶2</b>: for "an synonym", read "a synonym", twice.
+    (Corrected in the second printing.)
   </p>
 
   <p>
     <b>p.68</b>: the table of UTF-8 encodings is missing a bit from each first byte.
-    The corrected table is shown below.  (Thanks to Akshay Kumar, 2015-11-02.)
+    The corrected table is shown below.
+    (Thanks to Akshay Kumar, 2015-11-02.
+    Corrected in the Second printing.)
   </p>
   
   <pre>
@@ -68,11 +72,13 @@ pre {
   <p>
     <b>p.74</b>: the comment in <code>gopl.io/ch3/printints</code> should say
     <code>fmt.Sprint</code>, not <code>fmt.Sprintf</code>.
+    (Corrected in the second printing.)
   </p>
 
   <p>
     <b>p.76</b>: the comment <code>// "time.Duration 5ms0s</code> should have
     a closing double-quotation mark.
+    (Corrected in the second printing.)
   </p>
 
   <p>