Removed extra space in DC (#2)

Author: raheem03

source/state_thresholds.csv

@@ -14,7 +14,7 @@ CO,annual_wage,0.009615385,0,25,618,58344
 CO,2hqw,0.023076923,0,25,561,0
 CT,2hqw,0.019230769,0,15,649,0
 DE,2hqw,0.02173913,0,20,400,0
-DC ,hqw,0.038461538,0,50,444,0
+DC,hqw,0.038461538,0,50,444,0
 HI,hqw,0.047619048,0,5,648,0
 ID,hqw,0.038461538,0,72,448,0
 IN,annual_wage,0.009038462,0,37,390,0