feat: fixes support for 1.10 and 1.09.

Author: jcchavezs

README.md

@@ -3,7 +3,6 @@
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 A SQL wrapper including Zipkin instrumentation
 
@@ -59,6 +58,21 @@ sql.Register("zipkinsql-mysql", driver)
 db, err = sql.Open("zipkinsql-mysql", "myDSN")
 ```
 
+Projects providing their own abstractions on top of database/sql/driver can also wrap an existing driver.Conn interface directly with zipkinsql.
+
+```go
+
+import "github.com/opencensus-integrations/zipkinsql"
+
+func initializeConn(...) driver.Conn {
+    // create custom driver.Conn
+    conn := Connect(...)
+
+    // wrap with zipkinsql
+    return zipkinsql.WrapConn(conn, tracer, zipkinsql.WithAllTraceOptions())
+}
+```
+
 ## Usage of *Context methods
 
 Instrumentation is possible if the context is being passed downstream in methods.