corrected improper use of the tag <p> (fixes peclik#58)

Author: peclik

README.textile

@@ -23,6 +23,7 @@ h2. Installation:
 ** git: @git clone https://github.com/peclik/clipboard_image_paste.git
  plugins/clipboard_image_paste@
 * place plugin files into @plugins/clipboard_image_paste@ folder (strip possible @-master@ or @-version@ suffix)
+* restart Redmine instance
 * Redmine 2.5 and older: it's recommended to install RMagick gem, otherwise attached images will not show in exported PDF files
 
 --------------------------------------------------------------------------------
@@ -89,6 +90,9 @@ h2. Known issues:
 h2. Changelog:
 
 <pre>
+
+[-] Corrected improper use of the tag <p>
+
 28.06.2017 RELEASED 1.11
 [+] Don't remove alpha channel from PNG image for Redmine >=2.6
 [+] Added Danish translation

app/views/clipboard_image_paste/_add_form.html.erb

@@ -58,7 +58,7 @@
   <%
     if $clipboard_image_paste_has_jquery
   %>
-  <p/>
+  <p></p>
   <input type="text" id="cbp_thumbnail_link" readonly />
   <%
     end

suppl/cbp-standalone-test.html

@@ -85,7 +85,7 @@ <h2>Clipboard paste standalone test</h2>
     <!-- dialog to copy image link for wiki -->
     <div id="cbp_link_dlg" title="Copy image and thumbnail link" style="display:none">
       <input type="text" id="cbp_image_link" readonly />
-      <p/>
+      <p></p>
       <input type="text" id="cbp_thumbnail_link" readonly />
     </div>