[cassette] pass cassette pointer to yaml unmarshal instead pointer-to…

[asad-urrahman]

The cassete New() initialize cassete and returns a pointer, which can be passed directly to YAML unmarshal. no need to pass the pointer-to-pointer since its already initialized.

The cassete load panics with nil pointer exception with me. In this case, the issue seems in the YAML itself but passing a simple pointer solve here.

panic: runtime error: invalid memory address or nil pointer dereference [recovered]
        panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x20 pc=0x1076e32]

goroutine 7 [running]:
testing.tRunner.func1.2({0x109f9e0, 0x12c3290})
        C:/Program Files/Go/src/testing/testing.go:1526 +0x24e
testing.tRunner.func1()
        C:/Program Files/Go/src/testing/testing.go:1529 +0x39f
panic({0x109f9e0, 0x12c3290})
        C:/Program Files/Go/src/runtime/panic.go:884 +0x213
gopkg.in/dnaeon/go-vcr.v3/cassette.Load({0xc000f06960, 0x2c})
        C:/Users/asadrahman/go/pkg/mod/gopkg.in/dnaeon/go-vcr.v3@v3.1.2/cassette/cassette.go:280 +0xb2

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[dnaeon]

Merged, thanks!