Update README.md

Author: jomla97

README.md

@@ -195,55 +195,79 @@ err := record.CommitFileToContainer("field name", "/path/to/my/file.pdf")
 
 ``` go
 val := record.String("field name")
+
+//With error (ErrNotString if not a string)
+val, err := record.StringE("field name")
 ```
 
 #### Int
 *The FileMaker database field needs to be of type number.*
 
 ``` go
 val := record.Int("field name")
+
+//With error (ErrNotNumber if not a number)
+val, err := record.IntE("field name")
 ```
 
 #### Int8
 *The FileMaker database field needs to be of type number.*
 
 ``` go
 val := record.Int8("field name")
+
+//With error (ErrNotNumber if not a number)
+val, err := record.Int8E("field name")
 ```
 
 #### Int16
 *The FileMaker database field needs to be of type number.*
 
 ``` go
 val := record.Int16("field name")
+
+//With error (ErrNotNumber if not a number)
+val, err := record.Int16E("field name")
 ```
 
 #### Int32
 *The FileMaker database field needs to be of type number.*
 
 ``` go
 val := record.Int32("field name")
+
+//With error (ErrNotNumber if not a number)
+val, err := record.Int32E("field name")
 ```
 
 #### Int64
 *The FileMaker database field needs to be of type number.*
 
 ``` go
 val := record.Int64("field name")
+
+//With error (ErrNotNumber if not a number)
+val, err := record.Int64E("field name")
 ```
 
 #### Float32
 *The FileMaker database field needs to be of type number.*
 
 ``` go
 val := record.Float32("field name")
+
+//With error (ErrNotNumber if not a number)
+val, err := record.Float32E("field name")
 ```
 
 #### Float64
 *The FileMaker database field needs to be of type number.*
 
 ``` go
 val := record.Float64("field name")
+
+//With error (ErrNotNumber if not a number)
+val, err := record.Float64E("field name")
 ```
 
 #### Bool