Fixed #90. typo in documents.
Fixed #90. typo in documents.

cocoatomo/asakusafw,ashigeru/asakusafw,asakusafw/asakusafw,cocoatomo/asakusafw,asakusafw/asakusafw,ashigeru/asakusafw,akirakw/asakusafw,akirakw/asakusafw