Update abundance for 126Te isotope

[lmmentel]

Change the source for isotopic abundancies from nubase 3 for nubase 4. The only change between the files is the abundance for 126Te.

fixes #122

[kalvdans]

Using the git hack from #46 (comment) I was able to do a proper diff:

diff --git a/docs/source/references.bib b/docs/source/references.bib
index c0c3779..2a2b732 100644
--- a/docs/source/references.bib
+++ b/docs/source/references.bib
@@ -809,7 +809,7 @@
   author    = {F.G. Kondev and M. Wang and W.J. Huang and S. Naimi and G. Audi},
   title     = {The {NUBASE}2020 evaluation of nuclear physics properties {\ast}},
   journal   = {Chinese Physics C},
-  note      = {Data file: https://www-nds.iaea.org/amdc/ame2020/nubase_3.mas20.txt}
+  note      = {Data file: https://www.anl.gov/sites/www/files/2022-11/nubase_4.mas20.txt}
 }
 @article{IUPAC-InChI,
   author  = {Heller, Stephen R. and McNaught, Alan and Pletnev, Igor and Stein, Stephen and Tchekhovskoi, Dmitrii},
diff --git a/mendeleev/elements.db b/mendeleev/elements.db
index 6c5188f..030e2a0 100644
--- a/mendeleev/elements.db
+++ b/mendeleev/elements.db
@@ -9384,7 +9384,7 @@ INSERT INTO isotopes VALUES(1543,48,125.92243028999999409,NULL,126,2.47299999999
 INSERT INTO isotopes VALUES(1544,49,125.91646820200000433,NULL,126,4.500000000000000114e-06,1,1.5300000000000000266,'s','3',1.3426666666666664529,0.46999999999999997335,'+',1974,0.0036666666666666665984,NULL,0.010000000000000000208,0.050000000000000002775);
 INSERT INTO isotopes VALUES(1545,50,125.90765895799999895,NULL,126,1.1473000000000000098e-05,1,229.99999999999999999,'ky','0',0.0,0.0,'+',1962,0.0,NULL,13.999999999999999999,0.0);
 INSERT INTO isotopes VALUES(1546,51,125.90725315800000317,NULL,126,3.4189000000000000802e-05,1,12.349999999999999644,'d','8',0.16000000000000000333,NULL,'-',1956,0.0087500000000000008326,NULL,0.059999999999999997779,NULL);
-INSERT INTO isotopes VALUES(1547,52,125.90331214399999737,8.8399999999999998578,126,1.452999999999999895e-06,0,NULL,NULL,'0',0.0,0.0,'+',1924,0.0,0.25,NULL,0.0);
+INSERT INTO isotopes VALUES(1547,52,125.90331214399999737,18.839999999999999857,126,1.452999999999999895e-06,0,NULL,NULL,'0',0.0,0.0,'+',1924,0.0,0.25,NULL,0.0);
 INSERT INTO isotopes VALUES(1548,53,125.90562420499999518,NULL,126,4.0550000000000001394e-06,1,12.929999999999999716,'d','2',0.71899999999999997246,NULL,'-',1938,0.0020000000000000000416,NULL,0.050000000000000002775,NULL);
 INSERT INTO isotopes VALUES(1549,54,125.90429742199999907,0.088999999999999995781,126,5.9999999999999999601e-09,0,NULL,NULL,'0',0.0,0.0,'+',1922,0.0,0.0030000000000000000624,NULL,0.0);
 INSERT INTO isotopes VALUES(1550,55,125.90944582100000558,NULL,126,1.1120000000000000259e-05,1,1.6399999999999999023,'m','1',0.77600000000000002309,-0.64000000000000001332,'+',1954,0.0040000000000000000832,NULL,0.020000000000000000416,0.029999999999999998889);

Looks good to me!