Delete data file

emnist-letters-mapping.txt

@@ -1,26 +0,0 @@
-1 65 97
-2 66 98
-3 67 99
-4 68 100
-5 69 101
-6 70 102
-7 71 103
-8 72 104
-9 73 105
-10 74 106
-11 75 107
-12 76 108
-13 77 109
-14 78 110
-15 79 111
-16 80 112
-17 81 113
-18 82 114
-19 83 115
-20 84 116
-21 85 117
-22 86 118
-23 87 119
-24 88 120
-25 89 121
-26 90 122