Data URL points to inflation data instead of CPI data

[JakubChudik]

Reference:

cpi/scripts/cpi2datapackage.py

Line 12 in 3750e45

cpi_source = 'https://api.worldbank.org/v2/en/indicator/FP.CPI.TOTL.ZG?downloadformat=csv'

The correct cpi_source should be 'https://api.worldbank.org/v2/en/indicator/FP.CPI.TOTL?downloadformat=csv'

Also, the reference year is now 2010, not 2005.