updated readme

README.md

@@ -17,15 +17,15 @@ and compression schemes have also been tested using example bgen files).
 #### Usage
 ```python
 from bgen import BgenFile
-bfile = BgenFile(BGEN_PATH, SAMPLE_PATH=None)
+bfile = BgenFile(BGEN_PATH, sample_path=None)
 rsids = bfile.rsids()
 
 # select a variant by indexing
 var = bfile[1000]
 
 # pull out genotype probabilities
-probs = var.probabilities()  # returns 2D numpy array
-dosage = var.alt_dosage()  # requires biallelic variant, returns numpy array
+probs = var.probabilities  # returns 2D numpy array
+dosage = var.minor_allele_dosage  # requires biallelic variant, returns numpy array
 
 # exclude variants from analyses by passing in indices
 to_drop = [1, 3, 500]
@@ -37,9 +37,9 @@ dumped = pickle.dumps(var)
 var = pickle.loads(dumped)
 
 # iterate through every variant in the file, without preloading every variant
-with BgenFile(BGEN_PATH, SAMPLE_PATH=None, delay_parsing=True) as bfile:
+with BgenFile(BGEN_PATH, sample_path=None, delay_parsing=True) as bfile:
   for var in bfile:
-      probs = var.probabilities()
-      dosage = var.alt_dosage()
+      probs = var.probabilities
+      dosage = var.minor_allele_dosage
       ploidy = var.ploidy
 ```