feat(modules): migrate to go modules and bump go version 1.14.4

- migrate to go module
- bump go version 1.14.4

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/gonum.org/v1/gonum/internal/cmplx64/abs.go

@@ -0,0 +1,14 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Copyright ©2017 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cmplx64
+
+import math "gonum.org/v1/gonum/internal/math32"
+
+// Abs returns the absolute value (also called the modulus) of x.
+func Abs(x complex64) float32 { return math.Hypot(real(x), imag(x)) }