Updating butterfly + requirements.txt

sempy_core/requirements.txt

 numpy==1.20.2
 spiceypy==4.0.0
-scipy==1.6.2
+scipy==1.5.2
 matplotlib==3.4.1
 cffi==1.14.4
 multiprocess==0.70.11.1

sempy_core/sempy/core/orbits/butterfly.py

@@ -240,8 +240,8 @@ class Butterfly(CrtbpOrbit):
                 butterfly.state0[j * 2] += delta_sb * butterfly.continuation['null_vec'][j, 0]
             butterfly.T12 += delta_sb * butterfly.continuation['null_vec'][3, 0]
 
-            butterfly.state0, butterfly.T12, butterfly.T, butterfly.continuation['g_vec'], butterfly.continuation['null_vec'], flag = \
-                diff_corr.diff_corr_3d_cont(butterfly.state0, butterfly.T12, delta_sb, butterfly.continuation['g_vec'], butterfly.continuation['null_vec'])
+            butterfly.state0, butterfly.T12, butterfly.T, butterfly.continuation, flag = \
+                diff_corr.diff_corr_3d_cont(butterfly.state0, butterfly.T12, delta_sb, butterfly.continuation)
 
             butterfly.postprocess()