Merge pull request #545 from ma2tani/fess_dict

ja/mapping.txt change tilde to wave dash

src/main/resources/fess_indices/fess/ja/mapping.txt

@@ -15,7 +15,7 @@
 #   limitations under the License.
 
 　 => \u0020
-~ => 
+~,˜,῀,⁓,∼,∿,～ => 〜
 
 Ａ => A
 Ｂ => B