Update module oschwald/maxminddb-golang to v1

This MR contains the following updates:

Package	Type	Update	Change
github.com/oschwald/maxminddb-golang	require	major	v0.2.0 -> v1.8.0

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Release Notes

oschwald/maxminddb-golang

v1.8.0

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• Added maxminddb.SkipAliasedNetworks option to Networks and NetworksWithin methods. When set, this option will cause the iterator to skip networks that are aliases of the IPv4 tree.
• Added experimental custom deserializer support. This allows much more control over the deserialization. The API is subject to change and you should use at your own risk.

v1.7.0

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• Add NetworksWithin method. This returns an iterator that traverses all networks in the database that are contained in the given network. Pull request by Olaf Alders. GitHub #​65.

v1.6.0

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• This module now uses Go modules. Requested by Matthew Rothenberg. GitHub #​49.
• Plan 9 is now supported. Pull request by Jacob Moody. GitHub #​61.
• Documentation fixes. Pull request by Olaf Alders. GitHub #​62.
• Thread-safety is now mentioned in the documentation. Requested by Ken Sedgwick. GitHub #​39.
• Fix off-by-one error in file offset safety check. Reported by Will Storey. GitHub #​63.

v1.5.0

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• Drop support for Go 1.7 and 1.8.
• Minor performance improvements.

v1.4.0

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• Add the method LookupNetwork. This returns the network that the record belongs to as well as a boolean indicating whether there was a record for the IP address in the database. GitHub #​59.
• Improve performance.

v1.3.1

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• Fix issue with the finalizer running too early on Go 1.12 when using the Verify method. Reported by Robert-André Mauchin. GitHub #​55.
• Remove unnecessary call to reflect.ValueOf. MR by SenseyeDeveloper. GitHub #​53.

v1.3.0

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• The methods on the maxminddb.Reader struct now return an error if called on a closed database reader. Previously, this could cause a segmentation violation when using a memory-mapped file.
• The Close method on the maxminddb.Reader struct now sets the underlying buffer to nil, even when using FromBytes or Open on Google App Engine.
• No longer uses constants from syscall

v1.2.1

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• Fix incorrect index being used when decoding into anonymous struct fields. MR #​42 by Andy Bursavich.

v1.2.0

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• The database decoder now does bound checking when decoding data from the database. This is to help ensure that the reader does not panic when given a corrupt database to decode. Closes #​37.
• The reader will now return an error on a data structure with a depth greater than 512. This is done to prevent the possibility of a stack overflow on a cyclic data structure in a corrupt database. This matches the maximum depth allowed by libmaxminddb. All MaxMind databases currently have a depth of less than five.

v1.1.0

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• Added appengine build tag for Windows. When enabled, memory-mapping will be disabled in the Windows build as it is for the non-Windows build. Pull request #​35 by Ingo Oeser.
• SetFinalizer is now used to unmap files if the user fails to close the reader. Using r.Close() is still recommended for most use cases.
• Previously, an unsafe conversion between []byte and string was used to avoid unnecessary allocations when decoding struct keys. The decoder now relies on a compiler optimization on string([]byte) map lookups to achieve this rather than using unsafe.

v1.0.0

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New release for those using tagged releases.

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