要提交的变更：

	修改：     src/crmask.py
                   将统计被宇宙线污染的像素数目加入到HISTORY中

src/crmask.py

@@ -9,7 +9,7 @@
 #Software package dependencies, numpy, astropy, ccdproc and deepCR
 #Installation dependencies on Ubuntu 20.04
 #apt install python3-numpy python3-astropy python3-ccdproc python3-pip
-#python3 -m pip install pytorch deepCR
+#python3 -m pip install torch deepCR
 #Version 0.2
 
 #changelog
@@ -300,6 +300,9 @@ class CRMask:
         masked_hdulist[1].header.add_history(value)
         value = 'CRMask end at   {0}'.format(end_time)
         masked_hdulist[1].header.add_history(value)
+        #add total number of pixels contaminated by cosmic ray to HISTORY.
+        value = 'ccdproc.cosimicray_lacosmic detected {0:d} pixels contaminated by cosmic ray'.format(np.count_nonzero(masked))
+        masked_hdulist[1].header.add_history(value)
 
         if self.fill_flag:
             cleaned_hdulist = pyfits.HDUList()
@@ -423,6 +426,9 @@ class CRMask:
         masked_hdulist[1].header.add_history(value)
         value = 'deepCR mask model {0}'.format(clean_model)
         masked_hdulist[1].header.add_history(value)
+        #add total number of pixels contaminated by cosmic ray to HISTORY.
+        value = 'deepCR detected {0:d} pixels contaminated by cosmic ray'.format(np.count_nonzero(masked))
+        masked_hdulist[1].header.add_history(value)
 
         if inpaint:
             cleaned_image = pyfits.ImageHDU(data=cleaned, header=self.hdulist[1].header)