Update requirements.txt

update requirements of requests and pycrypto

requirements.txt

@@ -7,7 +7,7 @@ astroid=2.0.3=py36_1000
 blas=1.0=mkl
 boost=1.66.0=py36_vc14_1
 boost-cpp=1.66.0=vc14_1
-ca-certificates=2018.12.5=0
+ca-certificates=2019.1.23=0
 cairo=1.14.10=vc14_0
 certifi=2018.11.29=py36_0
 cffi=1.11.5=py36hfa6e2cd_1001
@@ -63,7 +63,7 @@ pixman=0.34.0=vc14_2
 plotly=3.3.0=py_0
 pycairo=1.16.3=py36_vc14_0
 pycparser=2.19=py_0
-pycrypto=2.6.1=py36hfa6e2cd_1002
+pycrypto=2.6.1=py36hfa6e2cd_9
 pyinstaller=3.3.1=py36_vc14_0
 pylint=2.1.1=py36_1000
 pymzml=0.7.8=pypi_0
@@ -84,7 +84,7 @@ pywin32=224=py36hfa6e2cd_1000
 pywin32-ctypes=0.2.0=py36_1000
 qt=4.8.7=vc14_7
 rdkit=2018.03.4=py36h857267b_0
-requests=2.19.1=py36_1
+requests=2.21.0=py36_0
 retrying=1.3.3=py_2
 scipy=1.1.0=py36hc28095f_0
 setuptools=40.4.3=py36_0