Inline csv dependency

Cargo.toml

@@ -36,6 +36,7 @@ bitflags = "1.0"
 lru-cache = "0.1"
 chrono = { version = "0.4", optional = true }
 serde_json = { version = "1.0", optional = true }
+csv = { version = "0.15", optional = true }
 
 [dev-dependencies]
 tempdir = "0.3"
@@ -46,10 +47,6 @@ regex = "0.2"
 path = "libsqlite3-sys"
 version = "0.9"
 
-[dependencies.csv]
-version = "0.15"
-optional = true
-
 [[test]]
 name = "config_log"
 harness = false

src/vtab/mod.rs

@@ -35,7 +35,7 @@ use types::{FromSql, FromSqlError, ToSql, ValueRef};
 // \-> vtab.xbestindex
 // stmt.query().next();
 // \-> vtab.xopen
-//  |-> let cursor: Cursor = ...; // on the heap
+//  |-> let cursor: VTabCursor = ...; // on the heap
 //  |-> cursor.xfilter or xnext
 //  |-> cursor.xeof
 //  \-> if not eof { cursor.column or xrowid } else { cursor.xclose }