Fixes #1: Missing README Information

Added warning for users to inform that the given database will be dropped first.

README.md

@@ -1,5 +1,7 @@
 # csv-to-influxdb
 Simple python script that inserts data points read from a csv file into a influxdb database.
+**WARNING**
+The database given via the --dbname parameter will drop the database first, then insert the csv data.
 
 ## Usage
 
@@ -62,4 +64,4 @@ timestamp,value,computer
 
 The following command will insert the file into a influxdb database:
 
-```python csv-to-influxdb.py --dbname test --input data.csv --tagcolumns computer --fieldcolumns value```
+```python csv-to-influxdb.py --dbname test --input data.csv --tagcolumns computer --fieldcolumns value```